Thanks Shane and Glenn. In the end I left Avid on this. I got an AAF (linking to the original media into Resolve and reconnected the media m manually from there, before carrying on in Premiere. I wasn’t 100% confident that the folder structure I had was the same as what the other editor had (another post house had been involved at some point as well)
I think the editor who sent me the .avb files and myself have learned something the hard way here. An AAF with truncated media probably would have been easier, but you get there in the end.
Again, thanks both for your help.