New to a game - etiquette?

[ethan]

I'm wondering what people's thoughts are on the following situation. This is a low-stakes game at my local coffeeshop...I've just moved to the neighborhood, and don't know anyone involved. I hope to become a regular at this game, and to make friends of the people watching/participating. I have no idea if the game follows the "cards speak" protocol, or if a player's required to declare his hand.

Flop: Q98r

Two players get all-in, one with AJ, one with AT.

Turn 2.

River J.

AJ reaches out and drags the pot, AT makes no objection.

Again, this is very, very low-stakes and the players aren't particularly good. I'd like not to ingratiate myself but at the same time they're giving a decent pot to the wrong person.

What do you do?