diff --git a/docs/faq.md b/docs/faq.md
index 3de099cdab4..dac8b0dff2b 100644
--- a/docs/faq.md
+++ b/docs/faq.md
@@ -91,6 +91,16 @@ If you have any questions, please feel free to create an issue!
 
 ## Data
 
+### Why isn't a record available?
+
+If you are unable to retrieve a record you are expecting to be able to find, it
+may be because it has not imported successfully, due to there being a quality issue with it.
+
+If a record has not met [OSV.dev's quality bar](data_quality.md), the 404 page
+for the vulnerability will state this.
+
+You should raise this with the home database responsible for the record.
+
 ### I've found something wrong with the data
 
 Data quality is very important to us. Please remember that OSV.dev is an
diff --git a/gcp/appengine/frontend3/src/templates/404.html b/gcp/appengine/frontend3/src/templates/404.html
index 76186370223..b1ab3107a5f 100644
--- a/gcp/appengine/frontend3/src/templates/404.html
+++ b/gcp/appengine/frontend3/src/templates/404.html
@@ -12,6 +12,27 @@
 {% block top_bar %} {% endblock %}
 
 {% block content %}
+{% if vuln_id %}
+<div class="mdc-layout-grid not-found-page">
+    <div class="mdc-layout-grid__inner">
+        <div class="mdc-layout-grid__cell--span-12 text-info">
+            <h2 class="heading">{{ vuln_id }} Not Found!</h2>
+            <p class="description">
+            {% if has_importfindings %}
+            The record has not imported successfully from its source<br/>
+            {% endif %}
+                Please see our
+                <a href="https://google.github.io/osv.dev/faq/">FAQ</a> for more information.
+            </p>
+            <div class="cta">
+                <a class="cta-primary link-button" href="{{ url_for('frontend_handlers.index') }}"
+                    aria-label="Get me back Home!">Back to Home</a>
+            </div>
+        </div>
+    </div>
+    <footer></footer>
+</div>
+{% else %}
 <div class="mdc-layout-grid not-found-page">
     <div class="mdc-layout-grid__inner">
         <div class="mdc-layout-grid__cell--span-12 text-info">
@@ -29,4 +50,5 @@ <h2 class="heading">Oops! Page Not Found!</h2>
     </div>
     <footer></footer>
 </div>
+{% endif %}
 {% endblock %}
diff --git a/gcp/appengine/frontend3/src/templates/list.html b/gcp/appengine/frontend3/src/templates/list.html
index 6f9dedf324f..d1ead29022a 100644
--- a/gcp/appengine/frontend3/src/templates/list.html
+++ b/gcp/appengine/frontend3/src/templates/list.html
@@ -128,7 +128,7 @@ <h1 class="title">Vulnerabilities</h1>
           </div>
           {%- endfor -%}
           {%- if vulnerabilities | length == 0 -%}
-          <span class="no-results">No results</span>
+          <span class="no-results">No results (check our <a href="https://google.github.io/osv.dev/faq/">FAQ</a> if this is unexpected)</span>
           {%- endif -%}
           {%- if page < total_pages -%} <turbo-frame id="vulnerability-table-page{{ page + 1 }}"
             data-turbo-action="advance" target="_top" class="next-page-frame">
diff --git a/gcp/appengine/frontend_handlers.py b/gcp/appengine/frontend_handlers.py
index a0b0dc2a9cb..753cad7fed3 100644
--- a/gcp/appengine/frontend_handlers.py
+++ b/gcp/appengine/frontend_handlers.py
@@ -55,6 +55,19 @@
 _DEPS_BASE_URL = 'https://deps.dev'
 _FIRST_CVSS_CALCULATOR_BASE_URL = 'https://www.first.org/cvss/calculator'
 
+
+class VulnerabilityNotFound(exceptions.NotFound):
+  """Plumb the vulnerability ID not found to the error handler."""
+
+  def __init__(self, vuln_id: str) -> None:
+    super().__init__()
+    self.vuln_id = vuln_id
+
+
+class VulnerabilityNotImported(VulnerabilityNotFound):
+  """Plumb the vulnerability ID with import findings to the error handler."""
+
+
 if utils.is_prod():
   redis_host = os.environ.get('REDISHOST', 'localhost')
   redis_port = int(os.environ.get('REDISPORT', 6379))
@@ -126,6 +139,11 @@ def robots():
   return response
 
 
+@blueprint.route('/favicon.ico')
+def favicon():
+  return current_app.send_static_file('img/favicon-32x32.png')
+
+
 @blueprint.route('/blog/', strict_slashes=False)
 def blog():
   return render_template('blog.html', index=_load_blog_content('index.html'))
@@ -251,15 +269,13 @@ def vulnerability_redirector(potential_vuln_id):
   # AlmaLinux have colons in their identifiers, which gets URL encoded.
   potential_vuln_id = parse.unquote(potential_vuln_id)
   if not _VALID_VULN_ID.match(potential_vuln_id):
-    abort(404)
+    abort(400)
     return None
 
-  vuln = osv_get_by_id(potential_vuln_id)
-  if vuln:
-    return redirect(f'/vulnerability/{potential_vuln_id}')
+  # This may raise an exception directly or via abort() for failed retrievals.
+  _ = osv_get_by_id(potential_vuln_id)
 
-  abort(404)
-  return None
+  return redirect(f'/vulnerability/{potential_vuln_id}')
 
 
 @blueprint.route('/<potential_vuln_id>.json')
@@ -269,13 +285,11 @@ def vulnerability_json_redirector(potential_vuln_id):
   https://api.osv.dev/v1/vulns/VULN-ID.
   """
   if not _VALID_VULN_ID.match(potential_vuln_id):
-    abort(404)
+    abort(400)
     return None
 
-  vuln = osv_get_by_id(potential_vuln_id)
-  if not vuln:
-    abort(404)
-    return None
+  # This calls abort() on failed retrievals.
+  _ = osv_get_by_id(potential_vuln_id)
 
   if utils.is_prod():
     api_url = 'api.osv.dev'
@@ -524,12 +538,15 @@ def osv_get_by_id(vuln_id):
 
   bug = osv.Bug.get_by_id(vuln_id)
   if not bug:
-    abort(404)
-    return None
+    if osv.ImportFinding.get_by_id(vuln_id):
+      # abort(404) is too simplistic for this.
+      raise VulnerabilityNotImported(vuln_id)
+    # abort(404) is too simplistic for this.
+    raise VulnerabilityNotFound(vuln_id)
 
   if bug.status == osv.BugStatus.UNPROCESSED:
-    abort(404)
-    return None
+    # abort(404) is too simplistic for this.
+    raise VulnerabilityNotFound(vuln_id)
 
   if not bug.public:
     abort(403)
@@ -705,6 +722,11 @@ def list_packages(vuln_affected: list[dict]):
 @blueprint.app_errorhandler(404)
 def not_found_error(error: exceptions.HTTPException):
   logging.info('Handled %s - Path attempted: %s', error, request.path)
+  if isinstance(error, VulnerabilityNotFound):
+    return render_template(
+        '404.html',
+        vuln_id=error.vuln_id,
+        has_importfindings=isinstance(error, VulnerabilityNotImported)), 404
   return render_template('404.html'), 404