We have the same thing. They'll send 6 package cars to stop there on their way in and take what will fit. I have received two different answers from Center Managers as to why.
One center manager said that it is too expensive to send a trailer to pick them up. If that's the case, fine, save money. Another center manager said that if feeders picks them up, the package center will not get the credit for the pieces. OK? So waste a lot of money just to make your center look good?
I don't know which reason is correct, but it sound pretty stupid either way.