[smacktoward]

Typewriters have signatures too: http://en.wikipedia.org/wiki/Typewriter#Forensic_examination

[tomjen3]

Sure, but the government wouldn't have a database of those anywhere and getting rid of a typewriter isn't likely to get anybody noticed (I cleaned up in the attick the other day, can you believe what I found?).

[skinnynerd]

Good link, thanks.