This was already confirmed a TBG.

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A box without hinge, key, or lid,
yet golden treasure inside is hid.
- Bilbo Baggins/J.R.R. Tolkien, The Hobbit
The answer was Egg.
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@maxskywalker: An egg.
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Two legs sat on three legs eating no legs when along came four legs and stole no legs from two legs. When four legs ran off with no legs, two legs picked up three legs and threw it at four legs until four legs brought no legs back. What happened?

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I'm thinking that a collection of riddles isn't really a discussion...and probably fits better over in the Text Based Games forums. It could join similar topics over there like:
Rate the riddle above you
Riddles
Riddles and puzzles!
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