If for some reason you are concerned about corrosion on a machine from being in close contact to salty air in the container, consider this:
The U.S. has over 10,000 miles of coastline with hundreds of tourist attractions that have thousands of pinballs. Example: Marty's Playland in Ocean City, MD is right on the boardwalk and storms have been known to send the Atlantic swirling around the pins' legs.
Which has more corrosion, the pin that spent three weeks in a container or one that has spent it's whole life next to the ocean?
Today, condition is King.