Use the phone. I have an ad on sturm for the last 2 weeks for an NFA item and had about 4 responses. All ask for pics, and all asking for a pic of the forms. I've provided pics in a couple cases, but no pics on the forms unless we can work out a phone call. Not happening unless we can have a discussion on the phone first. Then I'll be asking who your transfer dealer is. The NFA world has less than two degrees of separation. We're talking about less than 10k people, probably much less. If I don't know you or haven't heard of you or your dealer, then we certainly know someone in common? And then can provide a reference one way or the other, communicate and then maybe make a deal. I can't think of a buy or sell I've done without a phone conversation, except small parts, and even then I'll likely verify a mailing address on the google. If you're just relying solely on email without other verification you're gonna get burned. It's a daily occurence on sturm, just by sheer volume of transactions.