Tonight I wrote back to her and told her the name of the store and the date I bought them all from (luckily all from the same guy!), so if she can check those records, she'd be able to see... but I put that info in my original email to support, so I'm not holding my breath.
I'm going to have to buy all the map pieces again, I know it. How totally sucky is that? Over 500K lost. Again. Bah.