"Through can work on anything, but it depends on your magic whether you'll get stuck. One meter should be fine, I think."

Scott looks for a stairwell. 

There is one behind the counter! And a door with a staircase symbol labeled "authorized personnel only."

Is there a bathroom nearby? Near the stairwell, maybe?

Not near the stairwell, no.

 Sharing a wall with the stairwell? 

Nope.

However, the stairwell shares a wall with outside.

"Stiles, you hold down the fort."

He heads outside. 

Glance around for observers?  

Stiles hangs around, being vaguely useless. 

Occasional, but the wall the stairwell shares with outside is a back wall so no one actually passes through that alleyway.

Dramatic ballet! 

"Through, take me through this wall if you can." 

It can!

He heads upstairs, quietly. 

Probably won't help if there's someone there, but it doesn't hurt. 

He reaches the stock, where there are many shelves and boxes with books. It's optimized for storage, not locomotion or prettiness, so it's quite hard to navigate quickly. It's also empty.

Can he sense the Clow card?

Yep! It's... somewhere in that mess.

He approaches the center of the room.

Magical girl pose! 

"Windy, find the Move and show me where it is." 

She looks at him and shrugs helplessly.

Can he sense the card now?

Any clearer?

Yep. It's definitely in that direction.

Great. Can he take a look at the shelves? Not too close.

Yep. That-a-way... in a box.

How many cards can he have out at once?

He returns Through and Windy to their place in his bag.

Hopefully the noise doesn't lead to any more moving shenanigans. Please?

No moving shenanigans.

"Song, appear on the other side of the box and distract it!"