How often/when do you get the trip preparation booklet with the window stickers?

[D-Trick]

Don't think I've seen it mentioned here, but today I received in the mail the booklets for my two reservations booked in January. This isn't the first time I've gotten them, as I now have 6 of the same sticker sheets (I keep the stickers, toss the booklet).

These are the WDW trip info/planning booklets that include a brief two pages of the booked resort, followed by general pages about the WDW resort info and planning tips.

Receiving one seems to be hit or miss as I've had way more reservations where I didn't get one than ones that I did.

I would assume everyone gets these? I've never seen anyone using the stickers on their vehicles like I do though...