Credit Voucher for Original I-Phone

The original purchasers of the I-Phone were given a credit voucher for $100 when Apple reduced their phone prices several months later. Owners were sent via email and text, a credit voucher number. Well 2 weeks ago I lost my phone and no one turned it in, so I'm trying to find my credit voucher number so I can use this to purchase another phone. My dilema is that I deleted my email but saved the text message which contained the info I needed--silly me didn't think that if I lost my phone I would have no information. Apple Customer Service has not been able to help because they kept no records and the refund program is over. AT&T was no help either. Has this happened to anyone else and/or can anyone direct me to a possible solution? I'd sure hate to lose these $100 now that I really could put it to good use.