RPF PREMIUM MEMBER
It's still not clear to me how many props were made for the film. Any of them, or indeed all of them, might have ended up on screen at one time or another. That's the thing, unless there's some distinctive marks or something for us to tell the various original props apart it can't be known which were onscreen and which weren't. The prop department would be negligent if they didn't have 3 or 4 identical props to hand at all times during filming. Accidents happen, props get damaged or lost.
You indicate that one prop in particular is recognised as the Hero prop. Do you know how that came to be? Is there provenance linking it to a particular scene?
Yes, a number of the diaries made it on screen. Various B-props were used in some close-up scenes, like the Hitler signature scene and the Leap from the Lion's Head scene too. However, the page order of the hero prop matches what was flipped through in key scenes in the movie like when Indy gets it in the mail and in the library scene. Distressing and weathering marks on certain pages also match. You can also see some of those pages in the Archives book.
I don't know how many props were made for certain. More than 10, likely a dozen or more. Others (including test books) that weren't used in production were made too.