This has been asked before, but it's a good question to remember. I went to a woodworking site and asked about wood storage. The answer I got was that heat and cold won't cause any problems, but moisture (either water or humidity) will. I'd reccomend placing the whole box in a heavy plastic bag, such as one of those 4-5 mil leaf bags, wrap it tight and tape it well. Maybe throw a moth ball or two into the bag (outside the box) to ward off bugs and mice.