I put them on the floor, hoping the contractor that built the building at least gets that much right!
Years ago i was at a popular US based home improvement depot (I won't mention their name:P ) buying fire extinguishers. I needed three and opened every box on the shelf to find three good ones. The rest were in various states of discharge.
I took the discharged ones to the customer service department and told them they were discharged. They told me "no, we sell them discharged, you have to take them to the fire station and have them charged."
I then pointed to the three that were charged (same brand/style/size) and said "then why are these ones good?"
I then proceeded to ask her how she would feel if someone had a kitchen fire and grabbed their brand new fire extinguisher and found out that it was discharged, right out of the box.

I'm sure they were all back on the shelf an hour later, but at least I felt better for trying.
Def