Arrived as expected.  Looked like it was just an open box model as all the plastic wrappings were sill intact.  Do not even think it was plugged in.  Only external defect was that the handle on the shipping box (Apple's box) was missing.Product booted up nicely first time.  I then added 32GB memory.  Booted again.  Downloaded the macOS updates.  Made a bootable clone. Then migrated (with great difficulty -- Apple's issues) my 10.12 based configurations to the 10.14 macOS.Then the keyboard (the "Magic" one that came with the unit) failed; some 11 keys, in a distinct pattern, failed.  Though maybe the keyboard battery was low, so I charged overnight but the keyboard still failed.So I called for assistance thinking that a replacement keyboard (remember there is a 90 day warranty) was a easy decision.  Nope.  For a working keyboard, I needed to return the entire package, all 27.5 pounds, meaning the iMac, the two cords, the mouse and the defective keyboard.  Crazy.  Now, the reader might expect that I have plenty of extra keyboards in my lab so being without this one keyboard for a few days is no bit deal, but to be without my entire system that I had spent hours (had not slept for 20 hours) getting the iMac setup was not a solution; it was a big deal.So Amazon support could not see the big picture.