I once installed a CPU onto a motherboard; the resulting machine didn't boot, and the initial attempts at root-causing the issue implicated the motherboard, so

I once installed a CPU onto a motherboard; the resulting machine didn't boot, and the initial attempts at root-causing the issue implicated the motherboard, so I arranged for it to be RMA'd. However, that meant the CPU needed to come out of the socket, and a small plastic placeholder that protects the pins in the socket needed to go back in. I did not take photos of it prior to removing it, and afterwards I really wish I had. This manufacturer appears to have made two different iterations, slightly different around just this area, with the same model number. The manual's instructions (which were written in broken English, b/c China…) were wrong (they were for the other version), and directly contacting customer support got me the same instructions. The pictures in the manual didn't match the hardware in front of me, so even that didn't help. I eventually "intuited" how it fit together, but I caused damage to the pins in doing so. A single photo of the assembled version would have really helped.