So from what I gather, Leather is meant to be sellable in the hunting shack and it used to be up until three weeks ago or so. I have checked and see no change logs mentioning leather being removed as a sellable item.
I have done research on this and out if has come the same thing most people in this topic have already said leather has never been able to be sold and is useless in every other way so that said i will be moving the to rejected
Sorry, either we've been unable to reproduce this bug with enough detail, or its not been considered a bug.
Nevertheless, we appreciate your efforts, please do not be discouraged in submitting new bug reports going forward.