Re: OOC
You don't know which prisoner corresponds to which item, although you may be able to guess.
The five infamous prisoners are:
The Mosswater Marauder
The Lopper
The Piper of Illmarsh
Father Charlatan
The Splatterman
Each one is a DC25 Knowledge: History or Knowledge: Local check. Bear in mind that you get +4 for the town library, +4 for the records from the offices in the prison, +4 for the records from the warden's office, and Kendra can assist research for +3 (She has the Helpful trait). So you can spend the day making a research check at +15. Because this is a research check and not a basic knowledge check anyone can make it untrained.
You have quite a few details about the night of the fire. Prior to the conflagration the prisoners, lead by the infamous five, had rioted and taken control of the dungeon below the prison. Warden Hawkran triggered the deadfall that collapsed the stairs (A9), trapping him and several of his guards with the prisoners but preventing their escape.
The prisoners took him and the guards hostage and demanded that the remaining guards above lower the freight lift, the burned out remains of which you found in A4. When the guards refused the prisoners began to climb up the shaft. In a panicked, ill-thought attempt to stop them the guards poured fuel oil down the shaft and threw down a torch, starting the deadly fire.