perhaps it is in the same place as your missing book?

That just proves you should have stayed in paradise! Jobs suck.

Your book, your chair and your monitor .... spooky

What a wino.

Tits

That used to happen in a place I worked. There was a shortage of nice chairs, and if someone wasn't there for a day or two someone else would come along and take their chair. Does it have any identifying marks? :)