Sure, you could use any of those materials, with certain conditions.
Wood is strong and rigid and if rigid enough, will protect the contents from heavier items or from bumps and such. Plastic can behave similarly, but many plastic containers are quite flexible. Metal can be very durable, but it would be good to line it with something nonmetallic or at least to wrap the electronic devices well so that there is no metal-to-metal contact that would possibly allow bi-metal conductivity and chemical reactions. That's where storage conditions enter the picture.
Certain vapors besides water are worth considering, too, but that would be an improbable problem for most storage locations. Ammonia, paint or related solvents, and various hydrocarbons such as insecticides could pose some risk.
Main things: Keep them packed securely. Well-sealed containers is the way to go. Keep them dry. If you can store off the floor, that would be a good thing, unless you are using a dry attic. Oh, yes, and keep them from getting too hot. Cold they can handle if you don't suddenly unwrap them in a warm place--let them warm to room temperature first.
Rodents and some insects might want to find their way in, perhaps to nest, perhaps looking for food. Mice do sometimes chew wires. So, again comes the security issue.
I guess if I were doing it myself, I would use good plastic containers that were well-sealed and contained padding (crumpled paper or foam peanuts or something similarly effective) and some silica gel.
Okay, I hope this helps or that you get some other great ideas that will solve your problem.
A lot would depend on how they would be stored. Stacked? On shelves? On the floor? In a basement or in an unheated storage shed? An important consideration would be to keep them DRY. A good trick is to include several of those silica gel packets that are in many shipping cartons, including shoes. I'd bet that you could get some from a shoe store, as they will likely have hundreds and hundreds to get rid of. You can even use cardboard if you store and wrap carefully, but they are less impervious to humidity or moisture on a floor.
