The incident happened on Saturday, June 30, just before 5pm in Station Road.
In the short time the victim was delivering the parcel, a man jumped into the van and drove off towards Kettering Road in Burton Latimer.
Now police have released a CCTV image of a man they want to speak to about the theft.
The offender is described as a white man, of medium build, with dark hair, wearing blue shorts, flip flops and a white/grey vest top.
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The man pictured, or anyone who recognises him, is asked to contact Northamptonshire Police on 101 or Crimestoppers on 0800 555111.