Do you collect these? If so, do you have pages for them or do you keep them in a stockbook?
To be succinct, there is nothing that I do not collect Philatelically speaking.
I do not specifically purchase these types of stamps / labels / Ephemera, it is just what passes my desk.
If I buy a "suitcase of unwanted stamps" at an auction, then whatever is inside, is collected. (Nowadays that is no longer possible, "junk boxes" in Western Australia are now fetching $300 and upwards, so the holiday is over)
I make pages (very basic ones) when I can find the time.
I do not use stockbooks, I found them too mixed to be of any use.
I find it better to have a page (blank with a pencilled country) in a sheet protector, alphabetically sorted in a binder.
That way I can put my finger on the most abstruse label, and its location, in minutes.
The Holy Grail as a worldwide collector, is attempting to be organised........