Should she return the cash?

Should she return the cash?

“I recently bought a winter coat at a garage sale for $5 as part of a neighborhood sale. When I came home, I found $140 in a pocket inside the jacket. My husband thinks I should keep it and that it’s their fault for not checking the pockets, but I feel a little guilty. They live about 30 minutes away, but I know that’s a lot of money. What should I do?”