I have seen these guns before. There will be a fair number of perfectly good guns headed for destruction but most as junk, torn up, black powder, air guns, fake guns etc.
There almost always seem to also attract something like an artillery Luger some old widow’s husband brought back from Germany. There has been some publicity about these and at least some depts are turning them back for sale.
The whole thing is idiotic in the extreme.
Smart police usually get anything worth having.