There's another step between 'delivery' on the tracking and the trade-in people actually seeing your books. It will probably take another couple days for them to be picked up at the delivery point, opened, checked-in, verified condition, approved, etc.
If you keep checking your trade-in list, it'll change status to "Processing..." once they've opened the box and scanned that interior packing slip. It'll happen pretty quickly after that - for me, 48 max window on that part. Usually more like 10 - 24 hours.
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