Do not oil it, wash it, etc. that will ruin its collectible value.
From time to time companies will put out these crates so what I would do is take some pictures (you have a camera?) and contact the company. I have yet to see a gun company that isn't overly friendly in customer relations.
It is a shame it was not filled with ammunition from that period! Though I am not sure I would want to run stuff that old through my shotgun! Besides, Remington shotguns are programmed to reject Winchester ammunition!