Looking to track completed downloads

Thanks for the interest. We can handle case 1 for you, but not case 2. Since we're incorporating an off-the-shelf web reporting package, I'm afraid we're limited somewhat by its capabilities.

I believe that Amazon's raw Server Access Logs will give you enough information to infer case 2, but you would need to process them at your end. Looking at the file spec, I see columns for Object Size and Bytes Sent:

http://docs.amazonwebservices.com/AmazonS3/2006-03-01/index.html?LogFormat.html

It would seem to follow that those two columns would be equal in the case of a successful download, and unequal otherwise.

Sorry that we can't help you out beyond that. Good luck!

Jason