So I updated the chapter in question, here on BCTS.
I just realized, however, that the evidence in question wasn't discussed. At least not out loud. Bill and Sylvia had copied everything they had found and presumably highlighted certain sections.
Interestingly, one of the two in the office revealed something unexpected to me while I was writing the update, forcing me to update the next chapter as well. Sigh. This is what I get for letting my characters have a certain amount of autonomy, I suppose.