AM you are correct in stating that card cheats (ie:Benders, crimpers, daubbers, nailers, sanders, ect) do know the card changing procedures. If they take the cards off too early, the cheat will know somethings up and leave. But usually the pit will suspect hole card play but not seeing the signs will call the eye.
These crooks don't stay on the game long, they bet it up and leave. Once they leave, the eye or the pit will request the deck(s) for inspection and wait for the cheat to come back (and plaster his picture, if they have one, all over town).
Card cheats wil sit at a game betting table minimum applying theyre craft and start marking the deck, then they will leave the table and either they will come back in 30 to 45 minutes or someone else will and they bet it up. Surveillance will call GCB at this point, having the previous games cards that are marked and the current play (knowing those too are marked) They will be detained and then see ya wouldn't want to be ya....
EXGM