I have bought a few used phones, and there is always something quirky that makes you wonder if you got a lemon. Sometimes it is just existing manufacturing faults, but how can you know?

An example: the WiFi connectivity is unexpectedly poor on a second hand phone, which could be caused by dozens of different issues, and some of those issues could be due to being dropped, liquid damage, poor remanufacturing, or component drift...

We bought a refurbished PC recently, and while upgrading the SSD, I noticed a shield around the CPU was completely misfitted: manufacturing fault or refurbishment error?