Meaning of FINDER in English
find ‧ er /ˈfaɪndə $ -ər/ BrE AmE noun [countable]
1 . someone who finds something that was lost or stolen:
The finder usually receives a reward.
2 . finders keepers (losers weepers) spoken used to say that if someone finds something, they have the right to keep it
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012