Sorry to hear. The actual UPC is the main proof of purchase w/many rebates. I've done many rebates and the rebate form is always worth reading in detail as they will use every excuse to deny the rebate. I noticed this one required an actual SIGNATURE as well which is another easy out for them if you forget to sign. I have even had a rebate that required you to print, cut out, and use their address label as a requirement. The nice thing about the Fostex Tx0RP mk3 rebate was that it made me buy a set of headphones that I would not otherwise have purchased. Now after experiencing my T50RP mk3's I would gladly pay list price for them....in fact I think they are likely the best sounding Planar HP's under $500.