The testimony is "barely searchable", the text seems to have been already OCRed in someway, but it's disconnected at parts (so a full search may fail, whereas a partial might succeed). It'd then be a problem of parsing and joining the parts in a coherent way... which may not be an easier problem than just re-OCRing everything.
Mmmm... I remember the scene in From The Earth to The Moon, if it was scripted "historically" then that might give a bit of context as to the previous parts of the testimony, right before the quote?
Edit: I did some more searching, and the best I've found is something that confirms your suspicions[0]: that the records are more extensive, and the PDFs available don't cover all of his testimony.
