"No evidence that the disk was copied or left the office...."
I pick up disk, I place disk in laptop cd/dvd drive, I image it onto hard drive as an iso file with one of 100 programs, I place disk back in case on put it back on the desk under a pile of bits of paper.
Pick up laptop, walk out of office.
Now tell me, look at your disk, the one you lost for a year, and tell me if you can tell it's been copied.
Given that it was lost, and therefore out of sight for a year, I could have taken it home and copied the ones and zeros off it by hand in that time, still without anyone knowing!
Muppets the lot of them!
Black helicopter cos these idiots would forget to mask the windows before applying the stealth black paint coat.