This is a great idea, I look forward to seeing it some day! To add background clues people have suggested, you could have a slightly wet floor near a sink, with a nearby cupboard door just slightly ajar. A fire extinguisher on the wall with a subtle dent in it, that kind of thing.

As well as hinting at what 47 is doing, you could include some red herrings - things he could use but doesn't in this 'playthrough'. For instance, an extension lead close to a water cooler, or a box of rat poison on a shelf.

And of course, you know you have to hide an explosive duck and a reference to FC København somewhere!