Received a well-packed use mid 2020 27" iMac.  Screen was in good condition.  Chassis has a few scratches around it.  The first thing I noticed was the rear RAM door cover was missing.  Second thing was the "magic keyboard and mouse" were replaced with a brand new wired off-brand replacement keyboard and mouse.  Another key point is the unit has a build to order serial number and deviated from the product description.  My unit has a 10th Gen i9 3.6Ghz CPU, but it only has the base Radeon Pro 5300 4GB video card.I attempted to contact the support via email as indicated on the piece of paper included with the device.  I still have not received any response (2+ weeks).The unit did power on and booted to the Sonoma 14.4 setup.