Oh shit. Isn't there any proof that you backed on ChipIn from the user's end? As imperfect a solution as it would be, you could just put an announcement on NMA and ask people who chipped in to send you proof and the name they want to put in. Otherwise, I really don't know, try to come up with another memorial that preserves the spirit? I don't know if anyone'd be pissed off by not being mentioned, though.