I'd go with This is a case of serious payback or complicated mental issues, not just random vandalism over hermit squatters, really. The hermit has no use at all for the ropes and gear, sleeping bags and fuel are easy enough, any food is just boring emergency ration type stuff, they really don't want attention and are well aware of what the NSR caches are all about and how much attention it would bring.
How marketable is any of that stuff, really? Not worth it for the risk and considerable effort. Especially with the landing pad vandalism and resultant risk it makes no sense on a mercenary level. At least a little outdoor ability is needed, and teaching the ravens to steal purses and electronics would be a far more profitable enterprise combining crime and hiking.
Angry unhinged irrational behaviour, possibly focussed on NSR but could be random.