You can't take chips out of your stack and put them in your pocket, or anywhere else off the table. If you want to take poker chips home, only do so when you're finished playing.

Like lottery tickets, casino chips are bearer instruments and whoever has the chip gets the money. Same with slot tickets, except then the casino gets the added advantage that after a certain period of time those tickets expire, so even if you do bring them back we may not have to pay them.