Unfortunatly, we do not have a Database that can tell us what key belongs to what customer.
Due to privacy concerns, Microsoft is not allowed to link a product key to it's owner. Microsoft does have a database of Product keys and we also have a database of users that have registered thier software, but those two databases are not linked
in any way.
The only courses of action, that I can recommend, are those listed in the support doc that Carey linked to.
Thank you,
Darin MS