If you are going to bring fake chips into a casino, the first few days of operation in a new territory is probably the best time to do it. I have been to several casino openings and most of the dealers don't know how to play BJ much less how to deal it. When Caesars Indiana first opened the guy next to me got paid wrong twice in about ten minutes. After he corrected the dealer the second time (both errors were in his favor) I told him he really didn't have to give the money back. He shrugged and kept playing. After a few more minutes I finally figured out why he did it - he was with the gaming commission.
If the new dealers can't pay a game correctly I imagine it would be pretty easy to bring in fake chips. Of course I am not advocating that just commenting on the timing.