Best Buy giving free games...?

[ASLplease]

I didn't want to make my Title long. So I went to N4G and I saw that if you bought a PS3 Fatboy within 30 days, they will give you a free game.

http://kotaku.com/5345257/best-buy-offering-free-games-to-prevent-ps3-slim-trade+ins

Those games are:
Infamous
MLB The Show 09
Killzone 2

I was just wondering, do you have to bring in the PS3's just to get the free game or do you just have to show a receipt? I don't know where else to post this, sorry if it's in the wrong forum.

[xbox_mole]

The way I read it, it's not just free, it's supposed to discourage folks from returning the PS3 fat system that they bought. I think it's more of the fact that if you have the item and are saying you want to return it to get the PS3 slim, they are supposed to offer this as a "customer save" so they don't have to take back the console you currently have.