That board is located inside the housing of a flexbay nvme carrier.  The shorter connector on the background side would be connecting to the nvme tray.  The longer connector at the foreground is a SFF-8639 connecting to the flexbay backplane (nvme and u.2 only).   I am lazy to take them apart but I attached some pictures of the carrier (same size as 3.5" drive) and the nvme ssd tray.  Both with corresponding connector with picture of your inquiry. [IMAGE][IMAGE][IMAGE]
  It's described as a T7920 HDD Interposer with a part number of 1HH93 I thought it might be a dual high speed NVME card (the quad is much larger), while the connector nearest the camera looks to be PCIe, the one at the top makes no sense as that doesn't appear on the dual cards I've seen pictures of, so I'm a little stumped.  It's the only picture of the item and the person who posted it is away till next week   [IMAGE]
Does anyone know what this picture is of?