Constable Brent Rush, of Queenstown, said they wanted to speak to the man after the incident outside ASB Bank on Camp St around 1.40am last Sunday.
''We would like to talk to the man pictured, who we believe can help us with enquiries into the matter.''
Anyone with information is asked to contact Const Rush on 021 191 2141, or call Crimestoppers anonymously on 0800 555 111.