WD My Cloud EX4 4-bay NAS enclosure, part WDBWWD0000NBK-00, serial WNL224200537. Diskless with no hard drives included; four drive trays are included.
Tested: powers on, drives spin up in sequence, and factory reset completed. Cosmetic scratches on the glossy top. Includes the original Asian Power Devices DA-90C19 power supply, 19V 4.74A 90W, manufactured 2013-10-26, serial YA98113O26052222200.
WD ended OS 3 support, so this is intended for local network use. No claim is made that RAID, Ethernet, or USB were tested beyond power-on and spin-up.