The Prydwen - On the Command deck, take the stairs to the bottom floor where Captain Kells is usually located. The report can be found left of the helm, on top of the one of the southern computer gauges.
Knight Wagner: Recon report, Knight Wagner recording. It appears the intel claiming the old C.I.T. ruins house an entrance to the Institute was incorrect. My scouts and I spent days combing the location for a way in and turned up nothing other than a couple of minor casualties... ...when a contingent of Synths boxed us into an old tunnel we were sniffing around. My immediate recommendation would be to follow the trail back on whoever provided that intel. I suspect some wastelander is feeding Protector Quinlan lies to earn some caps.