A G4S courier received a firearms injury to his leg during the incident outside the Tesco Express store in Nottingham Road at around 1.30pm on Friday 22 July.
Detectives have previously stated that they are looking for three suspects.
They are said to be black males who were wearing dark clothing and face coverings, possibly scarves, to conceal their identities.
A reward of £10,000 is currently being offered for information which leads to the arrest and conviction of those responsible for the robbery attempt.
The T-shirt and the bags were recovered from a car believed to have been used by the offenders - a stolen black Audi Quattro S3, which was found at Kingsway Gardens, in Watnall Road, Hucknall, shortly after the incident.
The items include a black French Connection t-shirt with the slogan ‘lucky fcuk’ printed on the front, and two drawstring sports bags.
One of the bags is black and grey, and has the Nike name and swoosh logo printed on it in white. The other is black and has no logo, but has a ‘B Magazine’ label stitched along one side.
Anyone who recognises the items or believes they know who they may have belonged to should telephone Nottinghamshire Police on 0300 300 99 99, extension 812 5636.
As well as calling Nottinghamshire Police directly, anyone who has any information about the robbery attempt or those who committed the offence can call also Crimestoppers, anonymously, on 0800 555 111.