Greater Manchester police on Saturday released images of Salman Abedi to help establish a timeline of Abedi's movements from May 18 through Monday night, when police say he detonated a suicide bomb that killed 22 people in the foyer of Manchester Arena as they exited an Ariana Grande concert.
Detectives believe the case may hold vital clues if it can be recovered, but warned the public to be cautious if they spotted it.
Greater Manchester Police has released an image of the suicide bomber with the hip-high case in the city centre on May 22. This image was taken from CCTV in the city centre on 22 May.
Though police believe Salman Abedi had the suitcase during the days leading up to the Manchester Arena bombing, authorities confirmed Monday that the suitcase was not used in the attack.
"I want to stress that this is a different item than the one he used in the attack", he said.
"We have no reason to believe the case and its contents contain anything risky, but would ask people to be cautious", Jackson added.
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"There are hundreds of thousands of bits of intelligence that come into both MI5 and the police anti-terror hotline which have to be investigated".
A "trainee pilot" has been arrested as the investigation into the terror network behind Salman Abedi spread to the south coast of England.
A total of 16 arrests have been made in connection with the attack - the latest being a 23-year-old man in West Sussex - but two people have been released.
Violet Mainda, a hairdresser who cuts the hair of a man who lives in the flat, described her client as a "normal bloke".
"The difficulty is the sheer weight of numbers of people that are on this list means that to give all of them enough security reviews is really, really hard so there will always be mistakes made and I think we have to accept that if we want to live in a free, open and democratic society".
He told me, but I can't quite remember what he said, he was from Libya. "He was from Libya".
A young Libyan woman, who would only give her first name, Kada, said the family raided in Whalley Range today were "very friendly" and had "adorable children".
Greater Manchester Police have said Abedi returned to the United Kingdom from overseas on May 18. "Where did you see him with it during that time?"