We left them be as kids,were allways told leave them for lost folk to eat!
Catch them sunning during the day.porky den trees will have quite a pile of droppings in its hollow base.
Any thing humans touch around a camp can get knawed. Missing bark,looking like some one cleared a patch off with edge of chain saw when fresh a good indicator along with droppings,have seen porkys feeding on more than bark too.
There was a market for certain quills and hides,research could give you ideas for preservation for buyers.
I believe its their liver you never want to eat,to much vitamin A?or something.