This refurbished M83 Lenovo is my fourth and by far the worst of the bunch. My first three were practically new in appearance which encouraged me to purchase again. This one has a scratched case, which is no big deal. But it arrived with several missing rubber feet, no case screws to hold on the side panel and it was absolutely filthy inside. I had to use compressed air to blow out as much black grit as possible.The machine booted up OK, which is what I am mainly interested in. However, as stated in the included instructions, there is NO Windows 10 product activation sticker on the computer … anywhere … inside or out. There is none in or on the packing box and none on the user manual.  The previous units I purchased had a Windows 10 sticker pasted over the old Windows 7 product code.If my next move is to send this back to Amazon, then so be it. I am very disappointed with purchase #4.One other minor glitch I should mention, all of my previous purchases came boxed with a new USB keyboard, mouse and WiFi dongle. This came with a very used, dusty keyboard with its cord haphazardly wrapped around it, NO mouse and a packaged WiFi dongle.And did I mention, I am very disappointed with purchase #4.