Mike, my experience parallels yours up to the point where you got the check cashed email 2-3 weeks later. I went to the Silencer Shop in early April with my trust and cash in hand. They filed the paperwork and wrote a check for me. Next communication I got was from the Silencer Shop stating that the BATF said "my" check had bounced. Turns out the BATF lost the check that the SS sent, and because the BATF had no payment, they threw away my application. SS resent everything that day, but that little snafu delayed my pending date to August 28th. So, the suppressor I thought I might have in time for Xmas (that was before the .gov shutdown) won't be released from BATF jail until probably June of next year.
I feel your pain, gents.