If I have too much to burn, I soak it in a bucket overnight, then drain and wring the paper. If it's already been shredded/torn small, the papier mache effect will be fraud-proof. You could use the bath if you have huge quantities. It helps in that I just tear off identifying addresses/paragraphs. The rest goes into normal paper waste. If that seems too much, I think the tip off the Old Kent Road is most likely to have what you want.