" Thermal Imaging Hammer" LOL May I suggest trying the
"Thermal imaging back end of a pipe bender" They usually work really good at drywall removal especially if you are miffed at the 'rockers and have a really good golf swing
At that retirement home we wired we had a real issue with the sheetrockers burying EVERYTHING, and it even got to the point they were unscrewing boxes and tossing them up in the ceiling and cutting fire alarm wiring! It got to the point where the rockers complained we were bashing too many holes in the walls and ceilings trying to find stuff they buried!! It all got resolved when they realized that if they stopped burying things they wouldn't have so much repair work to do..
