I bought 2 cans in the BoGo, registered them both. Registered 1 about 3 weeks ago, the other about 2 weeks ago. Still haven't received any email confirmation (I did try to register again thinking it didn't go through and got an error saying that suppressor has been registered already). I have emailed them twice (once a question about an accessory and once about the status of my registrations, to make sure they got through since i got no confirmation), both were 2 weeks ago and have heard nothing.