What would you do if you saw someone drop $20 while getting into a cab and they left?
pick it up and spend it. if they are gone then $20 isn't something i'd waste my time trying to find them over. if there was a salvation army person asking for money right there i would give it to them.
If there was no way to return it, then I would pick it up and keep it--only if there was not way to return it.
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