Where's Agent Barton?

"Lips are sealed," he agrees - and then makes good on that, considering a shelving unit. He reaches out and shakes it, determining how sturdy it is - and then, when he seems happy with that, reaches up to a higher shelf so he can pick his feet up off the ground - and then slide through the side of the unit. It takes him a moment to walk his hands back down the shelves, nudging things out of his way carefully so he doesn't knock anything off the shelves -- and when he finally pulls his hands in, he's nearly completely hidden behind the supplies on the shelf.