Fake or not?

Just bought a WD Red Plus 4TB internal drive from a big online dealer. It arrived in a plain box without any documentation, so I checked the serial number on the WD website - the number is correct, but according to Western Digital it relates to a different drive - an APOLLOCR 5400 128M SATA3 6GB/S 4.0 TB 6HD NAS. Have I been scammed?
Thanks, Alex

Seems it’s an OEM part, so all seems to be OK