yeah, and since there's NO way to tell the value of the card until you take it to an OfficeMax store I dont think too many people'll be rushing to Paypal you real money.
You'd likely be better off buyinjg tangible goods with the credit and then selling them.
that being said, if you're REALLY in the mood to deal I might be persuaded to go to the store with you and verify the balance on the card...