My buddy has 40 acres in Snohomish County along the skykomish river. It is remote with limited access, minus his driveway. He gets homeless meth heads that walk the river and constantly steal his gear. If you are finding trash, my guess is there is a homeless camp within a couple miles. Sucks...sorry to hear this happened to you. Be careful out there and make sure you take protection as these guys will attempt to rob you blind given the chance.