I'd stay far away from this clown. Buy at your own risk and warned peril. Assuming that the listed chips are even ~round~ is pretty optimistic imo, and problems with the production quality (even uniform thickness) of the chips produced by ASM-vegas when it was under this guy's watch are well-documented.
I wouldn't trust Red Ott to be capable of safely shipping me used chewing gum much less delicate clay chips, even if in pristine condition.
Be prepared for the worst customer service on the face of the earth if you bother to email him with questions.
Here is what I posted on the blue wall, with the intention of warning away any newbies that weren't aware of Red's horrid reputation on every level. Repeating it here for the same reason:
Hope it doesn't sound too harsh.