Hi all, i bought a WD Passport GO 500GB SSD for $49 from Officeworks as part of a recent deal. I immediately cracked it open and inside was a Sandisk SSD Plus 500GB OEM M.2 (M-Key) SSD. It has no label on the drive whatsoever so definitely an OEM drive, only found the model by checking crystaldiskinfo.
Beware that the M.2 SSD itself is adhered strongly to it's daughterboard so to remove it from the daughterboard i slipped a credit card to separate the adhesive from the drive. Be careful though.
All in all, looks to be a pretty good deal for a SSD this size if you want an internal M.2 drive ASAP and don't want to wait on slow Auspost delivery.