Safe sale... Really safe?

[Octagon Guy]

Been seeing alot of safe sales for AP. Is it really safe for both sellers and buyers?

For sellers :

Buyers might not be able to register online without the warranty card but they can do so at the Boutique during collection after they send in for servicing. From my understanding, anyone can send in for servicing but collection is by owner only. So either the owner, who is registered in the system, has to collect in person or the one collecting have to be registered as the new owner.

It actually defeats the seller's intention, isn't it?

For buyers :

It's always a risk to run into a scam. The seller might claim the timepiece as lost property? Since they are still legally the owner?

Am I missing something? Anyone care to share their thoughts?