Det Supt Bancroft said the force was working with partner agencies including the National Crime Agency to locate the suspects.
Det Supt John Bancroft said the suspects, both described as black males in their early 20s, were no longer believed to be in Wiltshire.
Anybody who has yet to speak to police and who may have information or relevant CCTV or dashcam footage is asked to contact police on 101 or via their website quoting log 69 of 21 February.
“We would like to thank everyone who has come forward following previous appeals, our enquiries have taken us further afield and we can confirm that we no longer believe the suspects to be in Wiltshire.
He added: "This is a large-scale investigation, and we are working really closely with partner agencies including the National Crime Agency to locate the suspects.
