Of all the places to hide secrets. Tony wasn't knocking it, maybe that's why Claire had found these items in the office. Why the whole top floor was sealed off and the apparition guarding these little bits of evidence well...it only made sense. He'd hide shit in places people wouldn't go to look too.
When the backing was safely removed Stark was scooting off again, donut remnant in his mouth, moving to go and grab some trays for the makeshift exposing. Swallowing back the donut he whooooshed back on over to the table, laying out the film. He picked up one of the papers on top of the stack. "Huh. The first part of it is regular business jargon, but he put notes in it. Every other sentence, see?" He offered the paper to Claire so that she could examine it for herself while he finished extending the roll of film into the trays. "Sounds like this guy was here too, doing the business thing, and recording his findings in between...do you know what Redrum was before you showed up here?"
Now that he thought about it--the dated photography made sense. For all their little amenities, modern technology wasn't one of them. Phones, internet, even cameras. So it was just as right that there wasn't a smart phone they were hacking into, or a Nikon.