I've only been in three contests so far, Gary and no, I have no clue who judged my turn-ins. I don't think that it's possible because of the double blind system BUT... what prevents someone from telling a friend who is judging "If you see such-and-such, you'll know it's mine so score it high." Maybe there's 4-5 other entries that look that way but then all five get scored high if that judge sees them all. I also know the person who used to organize the extinct contest at Piper, Kansas. He said that it was common knowledge around there that judges could tell by the turn-in box who the big names were and thus score them higher if they picked them out.
My point is that in spite of the fact the judging is blind, there are always ways that cheating can take place. That alone makes it necessary to at least have some sort of personal plan of action when you're judging an event to avoid such accusations. I'd just err on the side of caution.
KCBS Member #14287