I was issued a BM auto back in the day, and on base and in uniform you're generally fine. Off base they generally are considered concealed weapons. But catch-22, most CCW permits don't permit you to carry an auto knife! Apparently you must transport them in your trunk or risk serious charges. Seriously gay, but serious nonetheless.
Practically anyone can own one, but they are absolutely illegal outside their house (unless, again, they're on base and in uniform).
As long as they aren't on a hand receipt you're fine to trade or sell them, as far as I know. The buyer/trader is responsible for his own laws, and you are unlikely to be extradited to the Netherlands or France if it somehow does break their laws. If they are on a hand receipt, happy Article 15!
Good luck with your trade!