[dolinsky]

Indeed it does.

curl -I http://oink-prod.s3.amazonaws.com/cristina-export.zip

    HTTP/1.1 200 OK
    x-amz-id-2: gIfqnrhzuVR2HJIhT8Msk37Pp96qabi6Amtq6ZG9makBlT/d5z+bYivF27tac16v
    x-amz-request-id: 9A1C02D63152317A
    Date: Fri, 16 Mar 2012 17:47:27 GMT
    Last-Modified: Fri, 16 Mar 2012 06:09:58 GMT
    ETag: "6326a2bc6724b1566530f34f5d96bf26"
    Accept-Ranges: bytes
    Content-Type: application/zip
    Content-Length: 212717
    Server: AmazonS3

Wouldn't take much for someone to whip up a script to parse the search results to build a list of usernames to bounce off of. There's also a fair amount of item-specific data too.