There seem to be a lot of scams about at the moment where sellers apparently send items to a collection point and then nothing else happens.
The sellers involved mainly seem to be accounts which haven't sold for ages and then suddenly list high end items. After the sale and payment, they don't respond to messages from buyers.
Hopefully, this is not the scenario here.
All you can do at the moment is 'wait and see'.
If your item clearly doesn't move on to the authenticator, start an item not received claim one day after the latest estimated delivery date.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)