The players enter a room and disturb the contents.

Adversaries arrive and the players need to put the room back the way they found it (more or less).

Difficulty is opposed roll vs. Adversary Perception.

What's the skill the players use?

I'd use Perception as a gauge of what they saw and their memory of it.

Opposed Perception? Innnteresting!

Going with my gut, I'd probably say Stealth.

Ooh or Vigilance. Vigilance doesn't get enough love.

I'd use Perception as a gauge of what they saw and their memory of it.

And if they succeed but get Threats, maybe they have to do a Skulduggery roll to fix it.

You might try Discipline as well, if they intended to do that when they made entry.

I'd go with Perception if the PCs stated specifically that they made note of how/where everything was in case they had to return it to normal. If they said nothing, I'd go with Vigilance to see how well they noticed the details of their surroundings when they first walked into the room. And if the NPCs were just down the street and walking towards the house and the PCs were short on time, I'd have them use Cool.

Yeah, I think Krieger's got a good set there.

I'd let the player(s) provide the justification for which skill they're using to hide their tracks.

Both Stealth and Skulduggery can cover that sort of thing, and if the player can give a good reason why one should be used over the other, then let them use that skill to set the difficulty for any Perception checks made to notice if anything's "out of place."

I would always require player justification, and the difficulty should be different depending on the skill being used, with black to represent time constraints, but these skills could all be justified in my mind:

Skulduggery (to have done the searching in a professional manor?)

Stealth (to make it look like they where never there?)

Perception (to have taken note of things before hand, or see the npc's coming)

Vigilance (to be observant and remember the layout?)

Cool (to not panic and get things in order under pressure?)

Deception (to make it look like someone else messed up the room)

Discipline (to keep controlled)

Leadership (for one PC to guide the others to get it done quickly)

Charm (for 1 pc to delay the approaching NPC's)

The thing i love about this system is so many skills can be used for any given situation with the correct justification or creative thinking...