Not quite on topic, but I used the same trick for handing over my present on the first anniversary.
As the first is the Paper anniversary, I got the cheapest, tackiest notebook I could find, cut the holes (on Bognor seafront, with a traffic warden trying to ticket me as I sat in the car doing it... so romantic, eh) and glued the pages with a flap in the top page, then went back to her parents where we were staying at the time.
When I handed over my wrapped present, in front of her whole family, there were some raised eyebrows at what looked like a spiral bound notebook.
Her mother and sister left the room.
Mrs Norm opened it with an eyebrow raised and said "You've got me a notebook."
Her father and brother-in-law left the room.
She tried to flick the pages but, because they were glued, she said "You've got me a notebook that doesn't even work!"
The tone she used was such that even the dog left the room.
I am only here to tell the tale because, when she dropped it on the floor, the platinum ring with diamond and two sapphires dropped out of the "hidden" pages. It was touch and go for a while though.
Although I must admit the line "...notebook that doesn't even work" still has me chuckling to myself.