I think this is some kind of first hand seller so the prices can be very attractive.
Correct, Shenzhen Audio is one of the authorized Topping resellers.
Just today I got the notification that it has been dispatched by DHL from Shenzen, China, no idea how long this will take but Amazon state 15-27 December.
That's just a worst-case number to give them leeway on Amazon/eBay I think. It showed the same for me, both at the time of purchase and currently; huge month-long window all the way into January.
If you check the tracking number, you can see the estimated delivery date when it's available.
They will also text you a link with options for signature release, etc. if you create a DHL account.
DHL Express is very, very, fast.
Mine was sent out yesterday, scheduled delivery is this Monday, December 3.
https://www.ebay.com/usr/topssale
How would I know if they're authorized and how would it affect me?
Their Ebay product page says "More than 10 available" but according to that email, they most definitely do not.
Interesting. Just wanted to say that I got the exact same message as you in #434, but I did not buy from topssale (shenzhenAudioStore on eBay).
Their eBay listing also showed the same "More than 10 available".
Although I guess it is not untrue anymore, since they shipped my order.