Into the Taboo Lands
"Um ... yes", Stylus continued, flipping and reading and reading and flipping with alacrity, "Apparently, I think, though I could be wrong of course, because its not very clear, or it is very clear and maybe a bit to clear ...", he felt his tongue beginning to ramble, so took a breath, "I think that this white card has something to do with getting in".
At which point, he looked at it with great suspicion ... and desire that it might suddenly talk and justify its existence to them.
He noticed some very small writing along the bottom of one side. Mostly, a bunch of numbers: though he couldn't guess why a bunch of numbers would be useful for opening a door, unless ...
"It could be that the doors are magical, and respond to this code being read out to it".