Check to see if there is another junction box as part of the original can fixture, perhaps a foot inside the hole where the can reflector was mounted. If so, the hole may not be plastered over or have light fixture components mounted permanently where you could not reach inside and access what inside that second junction box.
The average homeowner who lost his house in the Oklahoma tornadoes should move for good and not rebuild. Too much complexity watchdogging the contractor. Too much a chance to be defrauded.