I would pick up the $10 bill and hold onto it if someone came looking for it. After the meeting, I would ask nearby staff if they had lost any money recently. If no one claims it, I would donate the found money to a charity or drop it in a donation box rather than keep it for myself. While it's a small amount, it's still not mine to keep, so I would make an effort first to locate the rightful owner before donating it to a good cause.
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