Police are appealing for information after banknotes worth around £60,000 were mysteriously found floating down a river in Lincolnshire.
A dog walker spotted the cash near to Spalding town centre last month.
Officers who recovered the banknotes say a large amount was damaged but a good quantity appear to be in fair condition.
They are now trying to trace the owner.
If they cannot it will become the subject of a court forfeiture order.
More top news
One of the six survivors of a horror plane crash which killed 71 people has appeared on camera to thank his supporters.
Giraffes could disappear from the planet if current rates of extinction continue, it has been warned.
Foreign Secretary Boris Johnson has been filmed accusing British ally Saudi Arabia of "puppeteering" in the Middle East.