Hiding in plain sight 
Until someone for whatever reason has to access it and finds words on washers 
Until someone for whatever reason has to access it and finds words on washers It's so strange that it can really work. At least I would never go to a place and start unscrewing furniture
Yeah. I think the bigger issue is if you get robbed and the piece of furniture is stolen by a thief who doesn't realize it has important info hidden in it. Or worse: "Honey! Surprise! For your birthday, I got you a new (thing you had washers screwed into)! I donated the old one to Goodwill." Ruh roh.