The manual I received with a recent purchase (used N90s) specifically addresses storage and makes no mention of silica gel. I always thought, rightly or wrongly, it (silica gel) is included with new equipment because most of it arrives here in the U.S. via container ships which means a fair about of time is spent in dock areas and on the ocean, both very humid environments. There's no mention of saving it in new packaging, just the usual "don't eat this."