There is a painfully simple solution to this situation.
You say that during the sale, you and the dealer went outside to test fly the drone... yes? That would explain why it is bound to another account.
Take it back to the individual who sold...
Agree 100%. The gen #1 Air is a noisy little bugger... quite a nice camera though, but because of it's age it is difficult to find reliable spare batteries. The big bonus is that you still get to use GO4... Which is a properly excellent flight...
I'm not sure what you're asking? The 'DJI Mavic Air', the original Air is obsolete, very noisy with a high-pitched squeal, and a very nice camera.
DJI dropped the 'Mavic' from the product name and put the 'DJI Air 2' and subsequent Airs on...