Presumably they have been gathering as much evidence as fast as possible: checking the phone logs of whoever called the taxi, using the witnesses’ account to look for CCTV that might give the reg of the car that the cases were bring unloaded from, maybe other undisclosed evidence. They will presumably highlight platform-trainer guy because that is the evidence where public knowledge can help, but keep everything else out of the public eye.
For all we know, this shambolic crew may have left their luggage labels from their last trip on the cases.
Meanwhile I am fascinated that here in the UK we are being urged not to approach the suspect. Yeah right: who exactly would approach a butchering double murderer ?