This same seller sold them last month for the same price. I got 3 of them for my offer price of $300 +shipping at the time and couldn't be happier. The packaging was great and it was as described.
I'm using one for my OPNsense server with a quad-port Intel nic, another one is running Windows 10 Enterprise with 16 GB RAM/250 GB SSD, and the third is going in my lab (along with
6x T630's I bought for $32/each plus shipping -- they came with 4 GB RAM/16 GB SSD/WIFI -- I'm looking at adding ram and bigger/faster SSD local storage on the cheap for a Proxmox cluster as well as a couple of DFI DT122). The goal is to have a low-powered cluster. I just need to find time to work on my lab now
(I was originally looking at going with a RPi 4-based cluster, but for the price at $32 a unit, the T630s with 4 GBs of ram were a lot better value for money, even though they will take a bit more power and space, they are a lot more flexible for this particular use case -- even if they have Realtek nics).