Target sends me $300 gift card by mistake--whats my play?

[cantsitstillbr]

I bought a camara from Target online a few weeks ago. They ended up screwing up and shipping out the wrong camara. Because the camara I wanted was in low inventory Target went ahead and shipped me the correct camara while temporary charging my credit card to ensure I returned the wrong camara. After refusing delivery of the first camara they un-charged my card. I recieved the correct camara and was only charged once. Today (3 weeks later) I recieved a $300 gift card "for an item you returned to us." Obvious screwup by target. Easiest decision ever? Any reason to return the giftcard?