ASUS Rampage II Gene MicroATX X58 chipset motherboards. These were used in a render farm back in 2010-2011 and decommissioned a few years later, sat in storage since.
Perfectly suited to small scale retrogaming builds. Retro styling and full 6 dimms, rare to find microATX examples with this chipset.
These used 1U copper heatsink blocks which are being sold separately as I would imagine gamers would want much larger coolers.
I/O plates were sadly not included.
Guaranteed not DOA.
I'd be willing to negotiate a take-all price if a retro reseller is interested in doing prebuilds or other value adds.