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If your vanity is located in a bathroom where there is a lot of shower activity the humidity being built up may be the cause. Condensation is caused when the surface of the metal becomes cooler
It takes two things to cause this to happen, cold and moisture.
If the room is cold, it is allowing condensation to form on the metal surfaces as they are the first to get cold and allow condensation to form.
You need to warm up the room, perhaps close off the vent? or lower the humidity within the room where ever its coming from.
If there is no leak, and your sure that this was not the result of placing a wet wash cloth, or having a drip from cleaning the sink top where water dripped down around the faucet, then you need to empty the entire vanity and not place metal cans under there. As I know of no other reason why or how this would occur. Leaving the vanity open may help with the moisture build up there, but the question still is why do you have this moisture in the first place?