If the marbles are protected well enough there's nothing to take the shine away. Glass is much harder than air!
I had a set of Akro ades and oxbloods from the 1930's that a very tidy little boy had stored in a 1933 World's Fair cigar box for decades. They were so pristine I didn't even know how to describe them when I put them up for sale. I got ... and sold ... them in my first few months of collecting. If there were any I wanted back from what I first sold, it would be the ones in that box. *sigh*
When I expressed my surprise to the now old man's wife about how well preserved the marbles were, she said "You should see how nice his train set looks". Apparently even as an 8-year-old he took great care of his belongings.