It all depends on who find the arms,
Brits renovating tend to hand it in, but if they can get money they sell it on the black. house clearances well could go any where,
on a death probably stays in he family, or sold to a dealer.
The last thing I saw was a very nice MK2 sten with 3 mags, it went of back into a dark hole for 500 euros, Another sten in bad shape, mags amo and a granade got handed in, they were alowed to keep the sten only a strange one that.
Lots of small hand guns 25 acp, 32 acp, probably WW1 bring backs. Saw a very nice Luger made up of a very nicely marked WW1 bottom and well marked WW2 upper, 1,200 euros about 9 years ago, There is alot of WW1 syuff about as well, plenty of G98s turn up. I picked up a beautiful 98 bayonet all matching that was handed in. There are Yougoslav bring backs floting about as well, not forgetting the arms from all the conflicts that France was involved in over the years.
And remember when the Germans arrived in WW2 the Gendarmes took everything with hthen into hiding. My local detachment from Bellac went into the hills around Gueret and fourgt running battles day by day, There is a small museam in the Gendarmerie in Gueret, have seen it but access is restricted. Lots of drops also in this area.
Bourganeuf a town North east of Limoges has a telephone exchange, it was where all the areas resistance calls were roohed through as a member of the resistance worked there.