I have a question regarding the items found. Im not very familiar with the A320.
First the O2 cylinder. Was that A320 fitted with gaseous cabin drop out O2 system? If so where are these fitted? Are they in the cargo lining?
Also, the slide found floating. Normally, the doors would be armed and girt bar would be engaged into the floor brackets. So the slide would be attached to the fuselage. I can imagine that anything is possible upon impact and soon details will follow but jst trying to work some things out at this stage.