A caution on any weapons that may have a ‘stamp’ accompanying them. You know what I mean, especially if a trust was created for thestamp issuing.
You are correct, but in Michigan I would guess the odds of coming across a "stamped" item is about a million to one. More important is for the husband to keep his wife informed on the overall value of his stuff, and teach her the signs of a "friendly" ripoff during a time of grief. Just like making sure she knows were all the insurance policies and safe deposit box keys are kept.
Even a letter left with the guns and explaining things, and addressed to her, should bring more peace of mind to both parties.