This is what Marshal Notes are for. You can leave your IG items in a box outside your tent, with the Marshal Notes explaining that in-game, those tags & items are located inside -- but you don't want muddy feet, and so forth inside your tent. The Game and other players are of course willing to be respectful of your out-of-game personal property. This solution puts the items are "in bounds" for the game fairly, and tags accessible to a Marshal. The down side? You lose the ability to hide your items, thus offering that modicum of protection.
You don't get to protect your in-game items by putting them in an out-of-game area, like locking them in your car, for instance -- which amounts to about the same thing.
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