That's the first April one I've heard of yet. I called Monday I think and they said they were in late March and a few in April so far. I have a stack that was submitted second week of April. I've gotten envelopes before with five Forms4 in one envelop, but the forms were sent over the course of two weeks. Not sure how/why they consolidated the returned forms like that. Save on postage(?)Form 4 suppressor on trust, check cashed 4-17-16, ATF mailed to FFL 11-03, notified me on 11-20, picked up.
Good luck to the rest of you!
Hope that means April forms will start rolling in.