Detective Sergeant Hannah Wright, of North Yorkshire Police said:
"If you witnessed the robbery or can help identify either of the people involved I urge you to come forward and contact the police or Crimestoppers straight away.
"I am particularly keen to speak to anyone who may have seen the two suspects after they left the store or saw anyone acting suspiciously prior to the robbery."
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The ticket, which appears to be dated 19th August 1980, was found at Haymarket metro station.