Mysterious Book-Box

The office manager at work called me into her office after lunch today: she handed me this little “book”, and I opened it:

amy-book-box-1Turns out it isn’t a book at all —

amy-book-box-2

— and inside is an accordion-folded strip, with numbers on each ‘fold’:

amy-book-box-3They’re only numbered on one side — 6, 7, 8, then “5 TO 10”, whatever that means.   Between the “In Fond Remembrance” on the spine, the bird’s-nest inside, and the numbering system, I’m baffled as to what its original purpose is.  The whole thing is tiny — maybe 2″ x 1″ x 1/2″ altogether, like two matchboxes stacked.  Anyone out there in Internetland seen this before?