| Oil is fine for short-term storage, but over time any dust particles which settle will "pierce" the oil barrier and wick moisture to the steel, resulting in corrosion pitting. For long-term storage, use a neutral, i.e. colorless, shoe polish or paste wax. This is what the Metropolitan Museum used for many years on their arms and armour collections. It will impart a slightly dull film and will be a bit more difficult to wipe off than oil...but less so than cosmoline or Vaseline!
The sealed PVC with dessicant is a good idea, too. If you're really cautious, you could do both...
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Use the Shift key, people! Keyboard manufacturers everywhere are ineffably saddened when you ignore what they made just for you!
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