A man wielding a Stanley knife used it to threaten a delivery driver in Swindon, police have said.
Police received reports about this incident from the Orbital Shopping Park at around 10.30pm on March 16.
Officers have released a CCTV image of someone they would like to speak to in connection to the crime.
A police spokesman said: "We understand that the incident happened some time ago but believe this man may be able to help with our enquiries.
"If you recognise him, or saw what happened, please contact us on 101 quoting crime reference number 54230029127."
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