I have the notched set up to $5,000.
I can not answer most of your questions, but can help with the Atlantis.
The Atlantis was the 1st casino closed in AC.
Gaming counted all chips and cash was put up to redeem all counted chips. Gaming turned their back and a few sets of the chips got notched. AC Gaming would have the cash to redeem the notched chips. Would they cash notched chips. Your guess is as good as mine. If you get them down, LMK. <g> I think it would cause a big uproar as gaming thought they were all destroyed. This information, you can count on!!!
BTW, a closet in the Atlantis was full of Playboy chips, mostly roulettes. Gaming never seen them and management left them there. I was told by someone that should know that security guards got them.