Harold
Like your sledge hammmer but i have always used a double bittted ax when i tell them that is how i'll find covered over boxes.
Most of the time I do not bother the general for one or two boxes. Just find em and go on. 13 would get a change/ extra work order signed before finish.
last job the drywallers stunk. change orders because of his no speak english sloppys increased the job by 35%.
