You Found $4,000 in Cash, Keep or Not?

Moral question from a story in California.

Cyclists found $4,000 cash all over the roadway. Found a wallet nearby. They tracked down the owner of the cash and gave it back!  

Question is what would you do?  Keep it or find the owner?

https://kymkemp.com/2020/09/08/fort-bragg-cyclists-discover-4000-on-a-rural-roadway-and-help-reunite-riches-with-rightful-owner/