I would try support again. They should give you the warranty. I just did this yesterday with three drives, two from Newegg, and one from B&H. So it’s not just Newegg, it’s seagate. I had to provide serial numbers and picture of invoice. The support rep fixed all three (separate orders each), various amounts of months missing from each (one was only 1 month and he still fixed it). In my case the website updated instantly once the rep told me it was done. I don’t see anything on my invoices that says oem or not, two exos and one iron wolf pro drive. My support rep was Kenneth if that helps? He was great and it didn’t take long, did it all via chat.

Unfortunately I think it’s just going to be standard practice for me to check each new drive and have seagate fix it. Seagate needs to set up some system that triggers when a drive is sold to the start the warranty, and it needs to be available for all resellers, because it’s not just Newegg.