So many fine guns are lost to theives. I'd say you are toast with regard to that Luger if you look at the situation objectivley.
Pistols are about the first thing that thieves look for, small and valuable, easy to sell.
The Luger of which you speak could be worth a few thou depending on rarity / condition.
A darn good case for gunsafes, it really is a part of firearm ownership.
Considering they were just in a closet for 35 years one thief or another was bound to get them.
Sorry about the loss.
Freedom is not free