Files (a possible situation)

Someone in an office might be sorting through some files and suddenly come upon something unexpected, something odd. Something could be missing, or perhaps there are some photographs or a manuscript or a receipt that someone was trying to hide, or had forgotten about, or had been distracted from, or had lost. Or maybe it’s something that wasn’t so interesting at one point but is more interesting now. Possibly someone could have planted something that would be of interest later, if found. So many files are simply kept.