In every ATF compliance check I ever had in the 48yrs of having an 01FFL,, every Disposition in the log book had to be accompanied by a 4473 of the transfer, or a valid hard copy of the FFL that the gun was transfered to.
Each and every one of either of those documents had to be present and accounted for (and valid and properly filled out, and on and on) for each transaction in the log book since the last Compliance check and sign off by the ATF Agent at that time.
I got checked at least once every 3 yr license cycle. Sometimes more.
Yes you can check 01FFl #'s for valid in EZ Check. That's great. It's another useful way to check the validity of the document.
So someone hands you a valid FFL (EZ Check says so) and you transfer the gun to them. Maybe the person who handed you the FFL copy had no connection the FFL.
A copy of the lic and a business card from the stack at the register?
There's a dozen different scam senarios that be hatched to use a fake FFL or use a valid one by an unauthorized person.
You do your best as as a business owner and FFL to avoid being caught up in any of it just like avoiding other scams(bad checks)
But if kids can print $20's at home and pass them at the local Stop & Rob,,FFL's can certainly be printed with valid looking info and changed names and addresses.
...and you won't find 03 C&R FFL's in EZ-Check.
Another reason to deny a C&R a sale I guess.
You do your best as a Dealer to verify the other person for who they portray themselves to be. Thats all you can do.
You don't charge the person with a crime that is stuck with a bad check because the person that passed it showed fake ID.
That they asked for ID is all that is required.
Govt issued picture ID that is currently valid is what is demanded in the law.
You have no real way of verifying other than looking at the documents presented (FFL copy, signitures, D/Lic, ect)
..if the check is bad,,the ID is probably fake too.