Remote file does not exist

[inveteratus]

[alan@work ~]$ vagrant box add esinabox https://s3.amazonaws.com/coffers/esinabox.box
==> box: Box file was not detected as metadata. Adding it directly...
==> box: Adding box 'esinabox' (v0) for provider: 
    box: Downloading: https://s3.amazonaws.com/coffers/esinabox.box
An error occurred while downloading the remote file. The error
message, if any, is reproduced below. Please fix this error and try
again.

The requested URL returned error: 404 Not Found

Is there an alternative URL we can use?