My Units have used bodies that still have glue from removed stickers on them and other obvious signs of use and wear.
They were removing stickers and leaving glue like that since M3 models. Some people thought it was because they were originally branded as the scam Kodak KashMiner. The real issue may have been from pending litigation with Bitmain over their PSU patent and claims their former engineer, who founded MicroBT, stole designs. That patent was supposedly revoked during litigation, but there was recent news that he was being held by police for new intellectual property infringement claims made by Bitmain involving tens of millions of yuan. They are probably removing the stickers again to avoid units being seized.