Generally, Grinder, I am siding with you on the issue of "suspicious" vs. "indicative of guilt."
Yet, let's at least begin with what John Follain reported, the one author who was closest to the very thoughts of the police/PLE.
Page 67 is where he reports on this:
It would be great, and even better, to put Follain's account side by side with Battistelli's trial testimony. Even Judge Massei found Battistelli, in the main, unreliable - witness the timing of their arrival!
One the face of it, Battistelli's paragraph six remark COULD have referred to an insurance fraud - not knowing whose room this was, and (at the time) NOT knowing if anything really had been stolen or not - not really - B. could have been thinking that, as the basis of his suspicions.
The owner of the room had not yet arrived to confirm or deny anything missing. And even then, on what basis would the PP believe Filomena?
Yet Follain tries to make even that seem far fetched - trying to belabour what for Follain is obvious - Amanda and Raffaele did this thing. Follain in writing his book is suspect-centric. They "said nothing" because as Follain tries to imply, they are now realizing their faking-of-a-break-in was not having its desired effect.
Follain is a weasel.