Anytime I can help.
Funnily enough I believe I found the first one of this set. An old boy called Barry told me he had a stack of the yellow A chips from when he trained with them in the 70s and they used to give them to the trainees to take home and practice with. Pity he said he threw 19 away and just kept 1, that always hurts. Took me a while but I managed to convince him to dig it out so I could see it and then he was good enough to pass it over to me (cost quite a few "drinks" though). I sent Tom the picture and lo and behold, not only did he use it but he managed to find out the numbers produced too! There have been a few more found now too, more the merrier. The Vic still had a large collection in their training school when I worked there in the 90s.
I still know lots of people who worked at Playboy and they keep threatening to dig out some chips for me but, sorry to say, most "croups" aren't that reliable when it comes to things like that so I'm still waiting.