Police have released a CCTV image of a man they would like to trace as officers investigate a theft in Chapel-en-le-Frith.
A woman left her Samsung phone and three bank cards on the 199 Skyline bus from Stockport in the early hours of Saturday, April 14.
She realised almost immediately after getting off the bus, which was the last service of the night, at around 12.25am near to The Packhorse pub in Chapel-en-le-Frith.
The woman called the bus company who checked the vehicle but said nothing had been found or handed in.
A Derbyshire Constabulary spokesman said: "We’d really like to trace the man in the image as he may be able to help our inquiries."
Call PC Paul Dobson on 101, quoting reference 18*167747, or send him a message at www.derbyshire.police.uk.
You can also call Crimestoppers anonymously on 0800 555 111.