UConn, it could be a lot worse...
Most guys who lose their books do it after they have 1000-2000 hours. Airlines really prefer to see original loogbooks w/ endorsements... ESCPECIALLY the first one. Some airlines require original paper logbooks. You'll still have everything but PVT/IFR.
I zeroxed my first logbook (with the endorsements) and keep it in a fireproof safe. You can also double-bag it and keep it in the freezer which will also work as a fire-proof box.
As for the airplanes you demo-ed, the dates and exact times are not super important, but you will need the actual tail numbers...if you make up tail numbers you could be screwed because those are in the FAA registration database (accessible online by anyone) and employers may randomly check some of your logbook entries.
In the past, some less-honest pilots would log "time" in airplanes (usually twins) that they saw sitting on the ramp. But today the interviewer might pull up the registration, and then you'd have to explain why you were flying a plane registered to the DEA or some celebrity...yes this has happened.