When does posession of an item become ownership?

is there a definite length of time that must elapse before an item which has not been stolen becomes the property of the posessor or:is there a defini

is there a definite length of time that must elapse before an item which has not been stolen becomes the property of the posessor

or:is there a definite length of time that must elapse before an item which has not been stolen becomes the property of the posessor

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