Depending on what service is used it has a delivered by date or refund. All the old stuff even if they used that level of service does not have that. So they keep the new moving to avoid giving refunds. Of course the reg mail doesn't have refunds but it moves with the stuff that does in the same bags. This was the reason I was given from my cp guy.
I don't think I have anything old I'm waiting on now thankfully.
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