Just be out of the house. Don't worry about the legalities of the firearms. Law enforcement personnel are so heavily taxed that they don't have time to do what you described. You can always call and ask, however, if an emergency pops up, those cops are out of there to attend to something more important.

Get a friend to help/observe him taking out his firearms. But it is more to make sure he doesn't walk out with more than the firearms he is coming for.

Now, most importantly CALL YOUR ATTORNEY. That is what they are getting paid for. Ask your attorney what you should do in this case.

And I found that like most things in life, it never goes exactly as you think it will. It may be fine.