I read some where that you have to have winnings of $10,000 at a table to be taxed. The pit boss would have a record of the chips you bought and then when you check out he would record the chips you get.
If they don't ask you to sign a payout slip, then no tax is payable.
However, if you keep accurate records, you can claim losses at the table against winnings at slots and/or sports book.
The best way to find out for sure is to call a casino accounting department and ask. Or call a host. If a host does not know for sure, they can find out for you. My host at Harrahs has been very accomodating in answering questions of this nature.
Life ain't always beautiful, but it's a beautiful ride.