Board Thread:General Sly Cooper discussion/@comment-27717005-20160201182440/@comment-1845428-20160216175624

You are totally right, I forgot about that. The only other thing I could think that he might put in the receptacle is his cane, but that likely would only take him back to the 1950s or so, since it was his Conner's cane and not Slytunkhamen's. I guess the cane could be older, but no more than a hundred years or so.

That's still assuming the time machine needs an item to date in order to work. Maybe Sly just wanted to meet Slytunkhamen and programmed the machine to take him there.