I don't see my craft listed anywhere either, and I bought my P4 directly from DJI. My P3P was bought from Drones Plus in Vegas a year ago, I don't it listed also. However I do see all of the accessories I've bought from DJI.
It would seem logical DJI provide a list of craft you bought, not just accessories. Seems strange they don't.
This makes me wonder, if I sell one of my craft, how do I DE-REGISTER it at DJI from having my name associated with it since I don't own it anymore? Kinda like a car registration, how to I get released from liability? I guess my only way to prove I don't own it is to get the buyer to sign a receipt with ID, in case the FAA ever called me about an incident.