Leanto disappeared (but camp only slightly pilfered?)

When I logged on today, I found that my leanto was gone (am just about to buy some land) and some simple food (mushrooms, berries) was gone from a box.
This puzzled me greatly, since I would have expected significantly more damage had I been raided, but all my valuables were still there, even the ones I'd stowed into the now-defunct leanto.
I understand you need a non-trivial amount of proficiencies to be able to destroy a claimed leanto, but the level of damage to my camp doesn't seem to reflect a skilled-up raider wandering the wilds (unless they were just really hungry for waxing toadstools). Do leantos disappear on their own?
This puzzled me greatly, since I would have expected significantly more damage had I been raided, but all my valuables were still there, even the ones I'd stowed into the now-defunct leanto.
I understand you need a non-trivial amount of proficiencies to be able to destroy a claimed leanto, but the level of damage to my camp doesn't seem to reflect a skilled-up raider wandering the wilds (unless they were just really hungry for waxing toadstools). Do leantos disappear on their own?