WEST Mercia Police were called to Oswestry sorting office, after staff reported a suspect package on Wednesday evening.
It was due to be delivered to a Lincolnshire address.
The Shropshire staff reported a strange smell coming from the package and when officers investigated they discovered it contained cannabis, worth about £20.
Sergeant Lee Johnson said: “The parcel was addressed to a property in Lincolnshire and so we have been in touch with the local police force there.
“The recipient will not be getting the package they were expecting.”