Color me silly but***, I believe you are either on a computer or a smart phone with internet access... But lucky for you the law is posted above... Secure storage behind a keyed / combination lock.. Read it and weep mister ffl man.
I believe that trailer was not only locked, also the wheels were locked and the hitch has a lock.. Well within the law....
And again there is no federal statue that says a ffl has to have a safe...
Well hell, they didn't brake the law! That means it is safe. Thank God we have our government to set these laws so we know how to store our firearms. No, since there is no law telling me, Mr No FFL, how I should store my guns, I will go leave them in my 16 month old son's crib. No law broken? Must be safe