Staffordshire Police received a call at approximately 7.45am yesterday morning (Thurs) after a member of the public had found a discarded blue top at the junction of John Rhodes Way and Reginald Mitchell Way next to the notice board.
Officers seized the top and it has now been sent for forensic analysis.
At this stage we are unable to provide any images.
The investigation into the robbery is ongoing and we would encourage anyone with information to come forward.
Please contact Staffordshire Police on 101 quoting incident number 152 of March 6, or Crimestoppers anonymously on 0800 555 111.