I once had a guy's wife contact me to say that her husband was broadsided on the way to the Post Office, and he was in traction in the hospital. I figured, there goes my $500.
Three months later, the gun shows up at my FFL just as described in the auction with a note of apology for the delay.
Strange, but true.
Three days is not a long wait. Gunbroker says to wait 5 business days. Sounds fair. No reason to panic yet.