It probably would.
The general advice is don't clean anything if it isn't in any danger of being harmed.
By leaving it as it is you have more options to sell it, you can always take it out of the packaging and clean it whenever you want but you can never restore it back to its original condition if a collector is looking for one.
The only time I would take anything out of its original package would be if the plastic was PVC and contained softners.
(You can of course artificially restore the patina and probably reseal the plastic as well but that takes effort)
You can put it in a glad bag, seal it with some of the silica beads to prevent any further oxidation but I don't think you have a real problem there.
