I thinkvthis is like driving 5 over speed limit. Technicslly, yes its illegal, but most police officers wont ticket you for it, though some will, its a chance you take. Same here. Technically it might be illegal, imm not to say, but if you log it in, and a couple days later log it out, one time, no money made (not even what you spent) then i woukd think odds are in your favor. But theres still a chance. Not to mention thst your book would first have to be checked correct?
"And whats this here? I see you logged out this firearms just two days after logging it in"
"I purchesed that firearm and when it arived it was not what i expected, i gifted it a couple days later as i didnt need it in my collection". Seems legit to me.
But its YOUR gamble. Therefore YOUR decision. The above is just my view.
Maderstion is key however, dont make it a habit.