When I've ordered something, most always the box has those "silica" packets. I re-use them. Some examples: in a photo box, where you've stored until "someday" you'll get around to them, or in my power tools carrying cases. Anywhere you might have moisture.
I was just down in Dominica and I put a couple in a ziplock bag and stored my external hard drive in there when I wasn't using it. Exposed to the humidity of the outside air and everything for a year. Didn't break yet but I don't know for sure if that was from the dessicant. But in general, humidity is never good for electronics. I had an idea for re-use/re-drying them but not sur eif it will work. AC units put out dry air right? - maybe the fridge would have dryer air than normal.
Two things: First, the Silica absorbs moisture to a point and then is no good. Sometimes you can put it in the oven and dry them out, sometimes not. They will change color. Also, even though they are marked "do not eat" I've had a child do that and it is an issue with poison control. (It was part of an Army MRE and she thought it was a packet of seasoning.)
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