Cant say i've ever found anyrhing strange just the usual burnt out cars, shotgun shells, Headstones, foundations of an old house,a make-shift homeless hut, weird chimney thing, horse cart from an old church, clay pigeon launcher, a chicken (alive) nothing that really stands out but i did find a double ended dildo working in a recycling center 2 years ago which i ended up tying to a forklift
One place I build at has quite a few busted open safes , was gonna maybe use one of them as a feature untill it got logged now they are under 3 foot of dead trees.