The grocer has made the offer to anyone who gives information that helps snare the attacker.
Posters showing an artist's impression of the person the police would like to interview in connection with the attack will be displayed in local shops today and throughout Leamington Spa.
The posters, showing a boy or young man wearing a distinctive jacket, have been produced by Warwickshire Police in the hope that someone will recognise and report him.
Police have described the offender as white, in his late teens, with dark brown hair and red inflamed spots on his face. He was wearing a black, anorak-style hooded top with a red front and silver reflective piping.
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