Local police are investigating a series of mail thefts from a Collins St building.
On the first occasion, investigators believe a man followed residents into the Collins St building about 1.30am on December 29.
Once inside the building he made his way to the mail room where he stole mail. He is perceived as Caucasian in appearance and about 25-30 years old with an average build.
At the time he was wearing a grey hoodie with a black baseball cap with the logo GLTH90, grey pants and dark-coloured runners. He was also carrying a black satchel bag over his shoulder.
On January 7 police believe a man and woman followed residents into the same building about 11.30pm.
They both entered the ground floor mail room where they stole a large amount of mail.
The woman is about 20-25 years old with long black hair and has a thin build. She was wearing green pants and dark blue runners, and was carrying a black canvas back with a Cotton On logo on the front.
The man is perceived as Indian or Middle Eastern in appearance and aged between 20-25 years old with a dark beard and moustache.
He was wearing grey pants, a black jacket with white writing on the back, and a black cap.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au