AFAIK The debriefing reports were all ammassed into one or several reports. I haven't found any de-briefing reports from individuals except those who witness the shoot down and/or crash of an fellow bombers; The Missing AirCrew Reports. Not that these can be considered infallable. On jan. 11, 1944, for example, all 8 B17s that were lost by the 381st BG were last seen at 11.22. Quite a coincidence! Many MACR's contain Individual Questionaires. These are standard question forms that were filled in by surviving members of crews that wer shot down. After the war these guys were sent to Camp Lucky Strike near Le Havre to be shipped back to the States. When back in the states, the were asked to fill out these forms. Some are very detailed about the shootdown and demise of crew members. Most are not, however.
During debriefings the air crews were usually asked what they had seen, anything out of the ordinary. New/awkward German planes or tactics. Did they see planes go down? Where? Did they see parachutes. What was their assesment of the damage at targets, etc.
Of course the questions would have been tailored to the specific job of the aircrew.
I have several Combat Mission reports of BG's that were on the January 11, 1944 mission. Some are sketchy to say the least. Others (usually those of the leading BG's) are pretty detailed. With all kinds of info on planes that went down or aborted and the reasons why. Also interesting are the claims made for enemy aircraft. If they actually shot down the number of planes that they claimed, the war wouyld have been over by Feb. 1944!
Will scan one and post it here, so you get an idea what theya re about. AFAIK there are no specific books that deal with this aspect of the war.
I'll ask my veterans what they were asked aftera mission.