Unfortunately, I don't think the "duplicate license" you requested is going to work. I could be wrong, but I think they will only issue duplicates for current licensees, not "replicas" of expired licenses.
Perhaps the FCC database contractor could help here, but I doubt if they would have actual copies of licenses. They would be more likely to just have records of the license, and could issue proof of license.
Another item you might consider is a copy of your listing from a callbook.
Please let me know if the FCC is able to send you a duplicate of your old license. I would love to get a copy of mine, from 1976. (WN2FKS) I'm pretty sure it's somewhere around my parents' house, but haven't been able to locate it.