William Carlin, 52, did not return to Castle Huntly prison near Dundee after a period of temporary release.
He was last seen near the city's King's Cross Hospital at about 09:00 on 5 November.
He has connections in Ayrshire and Newcastle, and Northumbria Police are helping with the search.
Carlin was jailed in 2013 after being caught with a security box containing Â£40,000 from a Sainsbury's in Prestwick.
He is described as 5ft 11in, with a slim build, short brown or grey hair and blue-grey eyes.
Police Scotland have warned members of the public not to approach him.
Police in Scotland and England are searching for a convicted armed robber who has been missing from prison for nearly two weeks.