We used to have a little cat - Flynn - who loved till receipts too, and would often bring them triumphantly through the cat flap. Mind you, he also brought us an action man complete with parachute too. Never did find out which kid he mugged for that one.
And oh yes - emery boards really get them going.
Isnt it lovely that you can look back on things with teeth marks in them and it reminds you fondly of cats you've loved? I have an umbrella which I've had for almost 30 years, and the thing that makes me smile whenever I use it are the little teeth marks in the wooden handle. Paddy chewed it when he was a kitten.