I find this to be a great thread. Really gives insight. If you ask me, I'd go by the Golden Rule, and that's the answer, period. I would expect others to as well. Am I really reading posts here that diss the lost and found box principle, and suggest we should save the office the trouble? It kind of comes with the territory that owners of a destination will have to solve what to do when items remain in the lost and found too long, but customers really don't get that luxury. No, a bungee cord does not need to go to lost and found, but items over $5 or $10 do. Finding something in a campground is an easy call, bring it to the ranger or office if nearby. If it has value, leave it with the assumption the owner may come back for it (if they have even really left). Finding something on the roadside is an easy call as well, no lost and found, leave it if it is somewhat obvious the owner will come back for it, help find the owner if the owner is identifiable (wallet, etc.) keep it if there is no likely way to find the owner and value is not enough for them to come back looking for it. It is kind of late in the debate to bring up campgrounds with no manager within 90 minutes. How common are those across the county, and was this discussion about those places, even if they do exist in good numbers in some regions? Golden rule says if in doubt, leave it. I accept the argument of not jumping to conclusions to call someone a thief, but given the items mentioned, if they were not thieves, then they weren't exactly good Samaritans either. It is a no-brainer not to take leveling blocks in any case, ok, maybe 99.9% of the cases.
Scrounging wood may be a different category, especially if you know for certain people have left. Many areas have laws now about transporting firewood, and some people leave wood for others to use. No one really leaves things made out of metal and plastic for the next person to use.