However, there's similar stuff going on that doesn't seem to be as
well-publicized. Walking by a mailbox this morning, I noticed a
sticker on it which said that due to "new security provisions", or
some such phrase, mail of certain characteristics --- IIRC, any
stamped mail over 16 oz., or anything addressed to (certain divisions
of?) the armed forces --- cannot be placed in a mailbox, and *must* be
presented in person at a post office.
I'm not in post offices much, but it's tempting to do that just to
look around for cameras, and see if they ask for ID...