Several years ago I found a fresh 2 point shed Thanksgiving weekend, BT. A few year back a member here posted a buck he killed that the horns popped off in the final bed. I tracked a buck a few years back that his compadre dropped a bonus shed while I tracked the one I was after. That was mid December. I have killed several late [ after the 15th of december] including a few last day bucks and all have been tight. Saw a tall spike today.
I don't think its unusual for them to shed prior to the 15th, but I still believe it is predominantly the exception rather than the rule. Good bucks still packing into mid /late february in BT.