A local business owner told 1News the man was dressed "like a ninja".
"I don't even know how he was allowed in like that," they said.
"I saw him go back behind the counter and I was like, what's he doing? He can't be behind there."
"We understand this would have been frightening for the members of the public who witnessed this event, however we want to reassure the community we take these incidents incredibly seriously and are committed to holding those responsible to account," police said in their appeal.
"If you recognise any identifying features about the person in these images, we ask you to get in touch with us immediately.
"We also ask anyone who was a witness or has any information about this incident which may help us with our investigation to contact us via our 105 phone service or online using Update My Report.
They asked anyone with information to reference the file number 220716/9306, noting that information can also be provided anonymously via Crime Stoppers on 0800 555 111.