It took a couple days, but I did eventually get an answer and a very favorable one, at that:
Thank you for your email.
I'm happy to confirm your subscription is up and running, and your subscriber code is ########. Your first shipment is due any day and should arrive shortly.
If there's anything else you need, please just ask.
Good news indeed, and very encouraging!
I would recommend anyone else who is concerned that they haven't gotten a confirmation email to drop them a line. Again, their address is startrek-ships(at)eaglemoss-service(dot)com (address adjusted to hopefully mitigate spam-bots).
Full speed ahead!