Not like a scammer to return and defend himself... just sayin.
My son had his crazy ex guess his email password, from there everything else was a "forgot your password" click away. It was a nightmare. Doesn't take much.
Lots of ways to explain this away but it would be a huge step in the right direction for the OP to slow down, and the "seller" to show a tracking number etc to the OP
Oh, and yeah, NEVER use Zelle or CashApp etc for online transactions....