I operate a pretty large user generated content site. Occasionally we'll get emails from people notifying us that one of our members has reposted something without permission, and we quickly remove it, rectifying the situation.
In Google's Webmaster Tools, however, we've been getting the same messages ever since Google started sending messages through Webmaster Tools. We now have 80 messages, but there are 3 or 4 URL's that we've been getting the same message for 2 years now. The message is that someone has filed a DMCA complaint against our site. We've never received one of these messages regarding a page that actually existed on our site, they were all remove and 404'ed long before we got the message from Google. Some of them are for URL's that have never existed. For example, they contain a page file name from one site, and a third level domain of another site, which can't possibly exist.
I don't want to appear like a jerk and just delete the messages if there is some action I can take, but I'm not protesting the DMCA's and there aren't any other options.
Is Google just falling down on the job here and provided a feature that doesn't really work right and no one is monitoring it? Or is there something else I can do?
I guess what really troubles me is that I keep getting the same messages for the same URL's, as if I'm supposed to do something which I am not doing.