Additional data points: I've had this happen on a defective basketball backboard (and adjustable armature) that I purchased, and on a car battery that wasn't d

Additional data points: I've had this happen on a defective basketball backboard (and adjustable armature) that I purchased, and on a car battery that wasn't defective, but was no longer needed because the car it was intended to go into when I ordered it was destroyed in a fire before the battery arrived. In the first case I expect it was the size/price to ship it back. In the second it may be because of postal regulations but I'm not positive (they shipped it to me without a problem, but perhaps they don't want to risk return shipment on an item that may or may not be defective so they have a blanket policy). Both cases required me to contact Amazon directly because the items were not listed in the "return this" section of their respective orders.