Thank you very much for the help.
I always left every watch to "steam off" for some hours after being worn for a whole day, so I avoided those problems.
In the meantime I ordered a good amount of silica bags from a seller on Ebay - you never know..

As for the vault collectors: am I missing some other important ritual that I am not aware?!

: They all rushed off to make sure there weren't any watches lurking
: in a dark recess that hadn't been wound in a long time!