Hertfordshire police have released a CCTV image after cannabis was sent via post at London Colney Post Office.
The incident took place at around 9.26am on Monday, July 10.
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PC Karen Archer said: “Our enquiries are continuing, and we are appealing for anyone with information to please come forward.
“We are releasing this CCTV image because we believe the person pictured may have been in the area at the time and could have information to assist our investigation.
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“Is this you, or do you recognise this person? Please email me at karen.archer@herts.police.uk with any information.”
Information can also be reported online at www.herts.police.uk/ro/report or by calling the police's non-emergency number 101.
Anonymous information can be given by contacting Crimestopppers on 0800 555 111 or via crimestoppers-uk.org.
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