Surprisingly, I already heard back from my appeal and received a refund.
I'd read on some of the Ebay boards, that back when this was happening a lot in 2020, when the packages were going through the postal adjustment machines, if a little package was hitching a ride on top of a bigger package, the little package could get dinged by the machines.
So check your accounts and see if you have any weird looking adjustments. Not an ounce here or there, but literal lb's., or a ridiculous upgrade in your packaging requirements.
Crappy thing is, it's hard to notice when you get an adjustment because they never e-mail notice when you get one. It just shows up in your account, and it has to be patently obvious when you notice you're in the red, or if you check your history regularly.
I have also gotten occasional credit adjustments in my favor, but it's always less then a dollar or so, if I've overestimated my weight on a 1st Class Package I sent out.
Good news is, the appeal process works if you take the time to use it. At least for now.
