I have a very funny apt story along these lines.
My sister was knocked over in an accident on Christmas day and whilst in hospital her house was broken into on boxing day
Anyway, I got the call from the police as she was in hospital and had to go to the house. I went with a friend who I was with at the time.
The police met me there and said "it might be upsetting to go in there, they have ransacked the place"
Me and friend gave each other knowing look and smirk as my sis, bless her was messy (as are the rest of our family!)
The last time she was in the house was getting ready for a big night out on Christmas Eve but then never returned as she got knocked over.
There were clothes EVERYWHERE, make up EVERYWHERE, she had been up in the loft for christmas decorations, loft door opened.
Bedroom was unreal - couldnt see the bed for cosmetics, make up, clothes, things were pulled out of cupboards from where she was looking for a certain top etc etc
I couldnt bring myself to admit that it was normally like this so I played along saying OMG she will be horrified when she saw this, poor girl etc.
THEN forensics were called - after a few minutes in the bedroom they came out of the bedrooms where they were taking fingerprints and said "hang on a minute, if all of this was caused by the intruder/s how come there is an ashtray that hasnt been disturbed, fine eyeshadow still in the pot etc etc they very quickly worked out that it was already like this and in fact the burglars had only been downstairs