I store my bags in their dustbags, and some of them are in their boxes, some are not. All of them are being put in the closet. I let out the closet open regularly and take out all the bags one by one to inspect them. I live in a country where the weather is hot all year round and the humidity level is high, so regular checking (however PITA it is) is necessarry.
I will take some pics of my closet some day. I just got a new build in closet, so there are still stuff to be re-arranged.
*Sarah*