Laws requiring you report your guns stolen within seventy-two hours are useless.

This is a silly, unenforceable law.

As a gun owner, I would certainly report one of my guns lost or stolen as soon as I noticed it was gone. I certainly could not live with knowing one of my guns was used in a crime, or worse, a homicide.

But, if I was buying a gun as a straw purchase, or selling one of my existing guns to someone who was prohibited from owning one, I could also notify law enforcement to cover my butt. But how would law enforcement know I did or did not within that 72 hour window? They wouldn't! The transaction was of a clandestine nature in the first place. It's not like there would be a paper trail to back-up what I reported to the cops! I could have waited a week, a month, or more to report the gun "missing", ensuring the gun was as far away from me as possible. 

The law-abiding are already complying and doing the right thing. The criminal element is just going to play along, and nobody will be the wiser.

So, what can this law accomplish? How could it be enforced?