The body parts vaporize too.
Not after you butcher them. You have to be quick to do that, but fortunately the process is so fast you can butcher them
in combat.
(Also goes for other kinds of beings, e.g, you can butcher and devour a person's limb while they bleed and cry on the cold floor, watching you do it).
I've survived for months as an evilsh adventuress on a diet of bogeyman hearts and with a waterskin full of bogeyman blood.
It doesn't vaporize.
So yes, bogeyman bone bolts should be fully possible. Or decorations. Maybe even bogeyman leather clothing.
I'd suggest trapping them in the fortress but cage traps don't work in adv mode and bogeymen fade away when the sun comes up
Chamber traps (ones that create walls around target area) will work though. Pressure plate, two raised drawbridges. All you need.
But anyways, the real reason that they dont attack villages, naturally, is that the collective presence of the villagers minds drives them away. After all, they only attack... When you are alone.
I suggest you stay a night in an elvish forest retreat without a traveling companion. Surely the elvish minds will keep you safe from bogeymen.
Or even in a human village, but outside any buildings.