AT&T Lost Receipt ideas

My brother purchased two 32 gig 3gs iphone (one for him and one for his wife) last week, before the unlimited data plan ended.

Today we both read the notice that you can get a $100 rebate, or exchange the 3gs for a iphone 4, but his wife threw out the receipt (he's not happy, I would imagine)....

(I never throw out the receipt for any electronics, I always put it into the box, or staple it to the manual, at least until the warranty is over...)

Has anyone ever tried to get another receipt from AT&T? (He purchased it at the local at&t store in Oklahoma.)

All I could think to do is go back to the store and see if they can print another one up. Also, print the credit card statement showing the purchase, and the at&t web site showing the iphone data plan starting.

Any advice would help....

Thanks!

Just to update everyone, he was able to return to the store, and got not online second receipt printed out, but he was able to take the $100 price match on his wife's 3GS.

One thing not mentioned is that now that the 3GS has the closeout price, it cannot be returned.

He now has to return on the 15th to pre order the iPhone 4, and pay a $20 restocking fee to obtain the iPhone 4. (His wife was happy with 3GS, didn't want the iPhone 4.)

Oh, and he can keep his unlimited data plan, which is good because he uses his sling box for about 5 hours a day while he works.... Over 2 gb on day 5 of his phone...... (and he is not even tethering, it's all legit usage....)