Well, they caught you. Not arrested, of course. Elves don't get arrested, there's no paperwork for it. They just put you somewhere warm and quiet with the door shut, then phoned somebody who phoned somebody else, and by the time anyone worked out what to do with an elf, half the night was gone. You're out now. Don't ask how. But Christmas morning is three minutes away and there are still presents in your sack!