Check the price cut tag, and it might say. Well, if Target's like most stores anyway. It might just have the month and date it was marked down, so look for that.
I'm surprised my Lego Indiana Jones and Kung Fu Panda got accepted considering all I had was the discs and manuals in old plain DVD cases. I'm just waiting for them to send the code so I can use my credits. How long does it usually take (my credits were deposited two days ago).