I prefer to tell people to spend their money more wisely - who knows if all the machines are working pulls, if the manufacturer still supports them (without a contract), what BIOS options are enabled out of the box, what the noise levels are like (the DT122 is known for being noisy), how large they really are, how effective they are at wicking away heat, or if they are missing anything (I.e. they didn’t get rid of the drive caddies along with the drives). The Reddit discussion doesn’t really provide much for details.
Skepticism is healthy, but it feels like you're taking it further than seems reasonable based on available information - you may still be right though.
Listing clearly states working/soak tested, pics look clean, you're covered by eBay Buyer Protection, not sure where your caddy point came from, but if anything is missing, irrespective, you're covered. Not sure I follow the logic that a different case, PSU board and fans will be noisy because the DT122 is, they use a similar CPU cooler/fan, but thats about it and the fix is easy/cheap (who doesn't have an 80mm fan kicking about and adapters are cheap) and a small PSU is likely to be audible, but it's not likely to be a screamer (relative term). Specs as posted on the reddit discussion in question (with dimensions):
System specs:
https://www.adlinktech.com/Products...\ADi-SA2X-BE_datasheet_en_20170616_3pages.pdf
As you prefer to tell people to spend money more wisely, the closest I could get was a cheap i3 6100 SFF with 1 PCIe, 4GB and 500GB HDD (i've grabbed two recently for £60-70), onboard is invariably Realtek, so budget £10 for an old intel PT-2T for firewall usage or £40 for something like an i340-T4, again this is usually parts bin fodder, it's a better CPU, the GPU is more suited to transcoding (Plex/handbrake) and the Dell/Lenovo SFF's run quiet, so may be a better option depending on the usage.
