A mystery dating back to 2014 has seen envelopes stuffed with cash turn up around a tiny village.
Each time around £2,000 worth of twenty pound notes have been dumped in plain sight in the streets of Blackhall Colliery, County Durham.
Police say 12 envelopes have been handed in over the past five years, the latest one being on Monday.
The cash has never been left in the same spot, and has baffled the former pit community.
The mystery parcels have led the police to interview local people and speak to organisations including banks and the Post Office, and even carry out tests for fingerprints.
Despite the police inquiries, the finds remain a mystery.
Detective constable John Forster, of Peterlee CID, said: "These bundles are always left in plain sight such as on pavements and discovered by random members of the public who have handed them in.
"This is the fourth bundle handed in this year.
"This could be the work of a Good Samaritan but we would like to thank the residents who have shown incredible community spirit by handing the money in.
"The circumstances remain a mystery so we would welcome any information that will help us get to the bottom of these random incidents."
If you have any information, call 101 and ask to speak to Dc Forster.
It is understood anyone handing in the cash could make a claim to keep it if it is not claimed by its owner.
