Good Samaritan notifies owner of lost wallet via message hidden in bank deposits

Discussion and many other stories and anecdotes of similar and related incidents:

https://news.ycombinator.com/item?id=21256640

Other submissions of the same story, with little or no discussion:

https://news.ycombinator.com/item?id=21256759

https://news.ycombinator.com/item?id=21250962