I will give you example of what happened to me here.
Not long ago I bought used RAMI from the guy here who had one post only.
In communication with him I raised this question : How can I trust you when you have one post only ?
His answer was straight : You don't have to trust me at all.
I have to take the gun to some dealer, who you will pay for the gun and that dealer will ship the gun to your dealer.
Why would you have to trust me ?
After checking on his dealer - all seemed legit to me. I called the dealer, gave them my credit card number, they shipped the gun to my dealer, and it all ended up well, for both parties.
Hope this helps.