If its not bright yellow, especially if you've whittled the end grain, then its probably black locust.
I've hiked out billets and staves before. It mightn't cost money but there's no such thing as free wood, especially when it comes to osage, tough heavy and hard. If you have the time, take a one handed sledge and a couple of wedges, and a hatchet. Split ,rough out, coat the backs with pva, let dry, then hike out.
Hamish.