Police have released CCTV images of men they want to trace over a scam in which cashiers in shops are tricked into handing over money.
The scam - known as ‘ringing the changes’ - involves thieves confusing shop staff into giving them money.
In one incident, a man walked into Dronfield Post Office on Thursday, April 12, and asked a cashier to change a large amount of money into different denominations.
But he managed to confuse the shop worker and ended up walking out with £175 more than he went in with.
The man was around 5ft 4ins, had dark curly hair, was of a stocky build and had a foreign accent.
A similar incident happened on Friday, April 20, at Newbold Fish Bar, Littlemoor, when a man asked for a bundle of £20 notes to be changed into £10 notes.
He then claimed he wanted coins and when he left the store the shopkeeper then realised she was £80 down.
The man involved was 5ft 5ins, aged in his 30s, had short dark hair and was possibly of Turkish descent. He was wearing a dark blue jacket and dark trousers.
And on Thursday, April 19, a man in Loundsley Green Post Office asked to change some sterling notes into euros. During the transaction, he said he had changed his mind and asked for a money gram instead, but left the shop with both currencies.
He was between 5ft 6ins and 5ft 9ins tall, of Asian or Middle Eastern appearance and aged in his late 20s or early 30s. He was wearing dark trousers and a jacket over a jumper.
Community Safety Inspector Dave Stone said: “We would urge all retailers and business managers to ensure staff are aware of this scam, as it can involve quite large sums of money.
“Offenders will often take advantage of a busy shop or counter and also the desire to provide customer satisfaction.
“Clearly staff want to be courteous and helpful but they also need to be mindful of this scam and be suspicious of any customer requesting large denomination notes be changed, or if they wish to cancel transactions once cash is on the counter.
“Ultimately, if a shop worker or cashier has any doubts or suspicions then we would advise them to decline the request and report it to police, with as much information as possible including the descriptions of the people and any vehicles they may be using.”
n Anyone with information should call Derbyshire Police on 101 or Crimestoppers on 0800 555111.