OMG Steely, I can't believe that for once you and me agree. Guess some folks don't understand the difference between a stop payment and a cancelled check.
As to the OP, currently a hard copy, faxed or emailed FFL is good to go. If he cashed your check and failed to send the goods then that is fraud.
I've noted your post in which you said you came to an agreement. I hope it worked out well for you.
Go tell the Spartans,Travelers passing by,That here,Obedient to their laws we lie.
I'm older now but I'm still runnin' against the wind