Hello - Tim Fowers here. We has some misprints in Sabotage so we are sending a sticker pack to make the needed changes. Also if your box does not open far enough to be a barrier, the stickers are used to fix this.
If you didn't get stickers and you would like some, contact us for a free set.
Also check out the how-to-play and FAQ here https://www.fowers.games/pages/sabotage