Depending on where in portugal this stuff was found, it could be like storing it in a desert.
east portugal is arid and dry, hot as heck in summer, mild winters.
the north, however has extremely cold winters, and therefore a big temp swing season to season.
I looked into it more and it seems that there are two differing stories.
one is that they are from a car dealer in portugal who kept everything interesting
the other "story" is that they belonged to a wealthy portuguese doctor who had a penchant for cool cars.
what's the real story? I don't know. cool find nonetheless