No, it is not illegal to keep a dollar bill if you found it. However, if you found a large amount of money, such as a wallet with a significant sum of money, it is your legal obligation to try and locate the owner of the lost property and return it to them. Keeping lost property without making a reasonable effort to return it could potentially be considered theft or larceny, depending on the circumstances.

In general, it is always a good idea to try and return lost property to its rightful owner, as it is the honest and ethical thing to do.
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