In addition to the name card in the seat tube, I also put one -- laminated -- inside the bb shell when I overhaul the bb. Some thieves will find the one in the seat tube, but it's a rare thief who would open a bottom bracket!
I hate those police stickers. Honolulu used to want you to put a new one on every year. The old ones were hard to get off, and they wouldn't apply the new one on top of the old one. Some guys had a line of them up their seat tube.
I only got one, and then didn't allow them to catch me after that! The damn sticker is still there, too.
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1959 Hilton Wrigley Connoisseur (my favorite!)
1963 Hetchins Mountain King
1971 Gitane Tour de France (original owner)
* 1971 Gitane Super Corsa (crashed)
* rebuilt as upright cruiser
1971 Gitane Super Corsa #2 (sweet replacement)
1980 Ritchey Road Touring (The Grail Bike)
1982 Tom Ritchey Everest
(replacing stolen 1981 TR Everest custom)
1982 Tom Ritchey McKinley (touring pickup truck)
1985 ALAN Record (Glued & Screwed. A gift.)