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Unfortunately, storing Stamped copies for longer than a year is just financially untenable for us, but when we first rolled out the Stamper, the programming to clear out old copies was left unfinished and never got completed, so they just kept building up. We recently realized over half of the download storage we were paying for at Amazon was comprised of all those old Stamped copies, very few of which were ever redownloaded again after the initial purchase, and even fewer still more than a year after the fact, so we finally completed the programming to take care of that.
Of course, buyers who kept a copy of their original download can simply access that file on their own computer anytime, without needing to redownload it again. That said, I've brought up your scenario with Management, so we're looking into possible solutions for you now, with our apologies for the inconvenience.