so stick to newspaper cuttings on ransom notes?
also - when I buy a printer in cash from the local shop and don't give them my name & address - how do they trace me?
It's irrelevant
It's not about tracing you. If you are a suspect in a crime, say for example you sent a ransom note that was printed on your printer in your house that you bought from a homeless guy with cash.. and because of other reasons, you were the prime suspect in that kidnapping. The police could get a search warrant for your house, seize any printer/computer in your home and have it analyzed, comparing the printing from the... oh hell..I've said too much