That's truly incredible. It is fortunate that it was discovered with the antler attached so that they could accurately date it, and that it was archeologists and First Nation folks who found it. I teach LNT (Leave No Trace) while on my canoe trips in Canada. Some of the principles are a bit extreme in my view, but one that is important is: If you find an interesting item in the wilderness; photograph it, document the location, leave it as you found it. It is now an "artifact" and consider reporting it to professional archeologists. If you remove it and take it with you, it has lost it's provenance and is now "loot". Having said that, I would find it hard to leave an ancient arrowhead where I found it.