Honesty at the poker table?

[WiredSevens]

I sit down at my local card club and buy into the 1/2 NL game with $300, in 12 green $25 chips.

I sit down in the 10 seat at Table 3 and I'm going to be BB next hand. The dealer chops up a green chip for me, giving me 4 reds and 5 whites. When he's done chopping my green up, he pushes it back to me along with the rest of the change! A few seconds pass and he doesn't realize his error and I double-check my money; He's given me back my $25.

As I was in the 10 seat and no one was paying attention I was the only one who knew of his error.

So OOT, what do you do? Do you give him the green chip back or wait for him to realize it and if not PROFIT?