In ordinary times, before 9/11, she was the type of girl mothers hauled into his office seeking solace for not having dates and fitting in with the hot crowd at school. While guiding her to an understanding that her parents' divorce wasn't her fault, he would have searched for ways to assure Morgan that she might spend high school and college with fewer boyfriends than the hottest girls in her class, but would have many deep friendships, while concentrating on the things she was good at — her science projects, her music, her sailboat racing.
-- From The Ripple Effect by Paul Garrison
One day in mid-May 1919, the historian and journalist Heinrich Friedjung was probably browsing through the showrooms of the Dorotheum auction house in central Vienna. After leaving the Franz Josef room on the first floor, where the auction of furniture and household goods of the late former imperial Austrian minister president, Ernest von Koerber, was in progress, Friedjung would have gone up to the second floor. When he stepped into the Rössler room, nothing could have kept him from examining the books on display there. Friedjung had at this time been cultivating a many-layered interest in Ernest von Koerber for nearly twenty years, and he would not have missed out on his possibly only chance of examining Koerber's library. He would have searched for the inscribed copy of Friedrich Naumann's Mitteleuropa.
-- From Empire and Identity: Biographies of the Austrian State Problem in the Late Habsburg Empire by Fredrik Lindström
I have searched in Google books for "would have searched". I found the two above examples didn't quite fit with the normal hypothetical use of "would have done.."
My best guess is that those bold structures are past form of "will have done..", signifying the author's presumption about past events. Or, they are just past form of "would have done..", a more tentative assumption than "will have done.."?
Could you please parse them for me? If the text was written in the present narrative tense, would the "would have done.." form remain the same?