No, it is not illegal to keep a dollar bill that you found, as long as you have not taken it from someone else without their consent. In general, if you find lost property, you are required to take reasonable steps to try to locate the owner and return the property to them. However, if you are unable to locate the owner or if the owner does not come forward to claim the property within a reasonable amount of time, you may be able to keep the property. The specific rules regarding lost property may vary depending on the jurisdiction, so it's a good idea to check your local laws to be sure.
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