Want to buy a second hand Vision Pro, have a few questions?

Been looking at swappa and eBay for a mint condition Vision Pro and saw it here some people highly recommending getting apple care one, how do I know that a used Vision Pro with a probably already expired warranty can still be covered by apple care one by a second buyer? Just by simply checking the serial number?

I already bought the Zeiss lens inserts in advance and I’m waiting for it to ship, now trying to decide how to get a good condition AVP, I’m concerned about buying one and having a problem with the lenses or scratches on the cameras sensors?

Is it possible to get a Vision Pro “already” under full warranty and once I have it I’ll be able to extend it on Apple Care One?

I just want to realize my dream of owning this device but having the peace of mind to use it and truly enjoy it knowing that it’s insured and under warranty.