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I had my air conditioner serviced. They sent a woman tech out. When the job was "done" and she departed, I discovered the woman left the indoor unit housing cover and screws off, laying on the basement floor; and outside, she left a metal plate from the outdoor unit laying in the grass.

Report her and get your money back, if possible. She’s either lazy and/or doesn’t know her business.  If I have to do half the job, I may as well do the entire job myself.  
An able-bodied woman with brain cells intact can learn HVAC.  Especially when it’s a woman doing a job considered “male,” it’s extra important her work be of excellent quality. 
Before blaming the shoddy job on her sex, do you know her situation?  Is she in need of a job that pays a living wage?  HVAC is an area of need that doesn’t require a degree, can be learned on the job, and has promotion potential for a decent wage. 
Maid at a motel requires about the same physical agility and stamina, but a single woman working 60-72 hours per week won’t make half as much as HVAC. In many areas, a motel maid will be unable to support herself.  
Living wage jobs for traditional Catholics are getting increasingly difficult to find. Among that population, jobs for single women who must support themselves are even more difficult to find. 
Nonetheless, there’s no excuse for shoddy, incomplete work. Just about anyone can reattach covers with screws and nuts!  

Good points, Matthew and Seraphina, but I decided not to report her. I figure maybe she was tired and had some brain fog which led to her absent-mindedness. I can understand one of the incidents happening but BOTH happening at the same time in two different places (basement and outside).  Good thing I saw the plate before running over it with my lawnmower. Anyway, the AC is running great. I'm sure if this is a habitual problem with her, she's already been reported or she will be in the future.