I am in the Double Rebate Race. I purchased the Note 7 for myself, and the S26 Ultra for The Wife, so two separate trade-in shipments.
Tracking and reply from Samsung show both packages arrived and the phones are in the Inspection process as of March 25. 5 of the "14 business days" for the inspections to be complete are passed with no update.
If the trade-in amounts were not so hefty, I would not be so uneasy until they are approved. These numbers, though, have me on edge.
Still, the old phones are in near pristine condition, so there should not be any issues.
I imagine that there is such a crush of trade-ins to process that the time to complete the process will take all or nearly all those 14 working days.