EDIT: Although maybe you're right, if the "gamblers" deposited funds to the casino via wire, direct from the fed, and then exchanged them for chips. So the casinos should presumably have some record of who came to claim that wire in chips.
Typical player tracking is done through comp cards, where they account for your buy-ins at the table, and buy out at the cashier.
and how would casino be laundering money then? :)
they do need plausible lack of total control and accounting of all chips' movements.
Casinos have cameras at the cage, and beyond that cash transactions in a casino have the same reportability as cash transactions everywhere. If it's in the US that means IRS paperwork at $10k. I have no idea what the limits are in the Philippines, but I'll bet they have video of the people who collected the money.
Chips can be flagged or invalidated by serial number.
[1] http://singularityhub.com/2011/02/12/1-5m-robbery-of-bellagi... [2] http://www.cnbc.com/2014/04/16/cheaters-may-speed-need-for-p... [3] http://www.gpigaming.com/rfid-technology/rfid-in-casino-chip...
Do you have evidence for this? I find it rather plausible that casinos have anti-fraud measures built into their chips to allow tracking of where each chip came from.
EDIT: A quick google shows this is indeed the case for some casinos at least: http://singularityhub.com/2011/02/12/1-5m-robbery-of-bellagi...
PS: In the US the government requires casino's to track large winnings for the IRS they hand out W9's.