I purchased both from gucci too.How odd. It seems several people have had this plastic odor with their bags. Mine has smelled always smelled like leather. (Again, I bought mine from Gucci, but would that make *any* difference? I tend to doubt it...)
It is odd. I too think its from the packaging or storage. It is a very unfamiliar smell. Maybe it is just their leather smell from production. Nothing that worried me or threw me off. The smell disappeared shortly after.
I will have my nose on my next gucci purchase (GG marmont matelassé mini) and see what happens

