FredricG wrote on Apr 27^th, 2020 at 11:26pm:

I understand that, but what I'm trying to say is that I cannot get access to the email associated with my former FSS account to get the order numbers. It's completely locked down / shut down.

I'm confused. I know that the FlightSimStore has gone, and you can't access any files from them (I bought many products from them) but any email you received from them should be in your possesion, not theirs.
I still have all the emails from them with the order number, product name, serial number, and the cost.