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Was the hard stuff in glass bottles with metal tops?
How did the alcohol evaporate in that?
I have iso alcohol - 70% - that is in plastic containers, the kind you buy drug store iso alcohol in - that is at least several years old, and one bottle that has been opened, it still has plenty of alcohol content - as evidenced by the sting when I use it on skin to disinfect it.
Isopropyl alcohol is a bigger molecule than the more svelt ethanol one. Typically booze stored in casks loses about 2% per year, this is called "the angel's share". Most plastics are permeable, the exception to this is mylar or plastics like nylofume that are intended to be vapor barriers.
Most alcohol is going to come in a PET bottle, which while still permeable, will do a better job of holding the bigger molecules than smaller ones. Glass is still the gold standard for a reason...