Not sure very many states do OTC Antelope anymore except a few units in Wyoming. Need to check the websites as things change every year. Thye ones that are leftover in Wyoming usually are in units that are largely private land.
I called out to Montana and the fella said typically they have a numbers of units that have leftover opportunity, expect this year. He said this is the first time all the tags went out. Even including all the archery opportunities.
Thanks for the other feedback. Ill keep digging and planning for the future.