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finder

finder /ˈfaɪndɚ/ noun
plural finders
finder
/ˈfaɪndɚ/
noun
plural finders
Britannica Dictionary definition of FINDER
[count]
: a person who finds something that was lost

finders keepers (losers weepers)

used especially in children's speech to say that you can keep what you have found and do not need to give it back to the person who has lost it