Originally Posted by riku2

On my last passport I printed a 3cm x 2cm label, "DO NOT STICK BAGGAGE TAGS HERE" and stuck it on the back which stopped most of the staff although amazingly some still stuck the baggage tag on (almost directly over the label!!!!!). Happily things seem to have moved on and there doesn't seem any need for the label anymore.
Those small "document ok" stickers seem to have been replaced by a more automated approach too, so good riddance to those.