Any old iron?

Well, any old tin really. A common sight in the forest, rusted through and crushed tin baths; I've seen innumerable examples over the years, along with pots, pans and kettles...always crushed. You'll commonly find them in amongst older trees in the open forest, not usually up in them though; and often in spots off todays' tracks. Evidence of past occupation, and archaeology of a bygone age. I always wonder if the crushing is part of some folk tradition or practice, otherwise what's the point; there are plenty of examples from the archaeological record of items being purposely crushed or broken before deposition or discard.