Thanks so much for posting all those screenshots, microbius. I'm going to print those out and keep handy. I looked once at this site for my photos but didn't see any, but will take another look tomorrow.
Earlier it was mentioned that this should be the agency's job. I wholeheartedly agree, but the fact is, THEY AREN'T DOING IT. They continue to take contributor's money but don't bother keeping the IP safe. Maybe instead of spending money on travel, parties, office massages, and all the other perks the employees at the agencies seem to get, money could be used to hire a full time person to track this stuff down and file DMCA notices, etc.