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...
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.
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.