Uh oh.
just nearly got caught out!
DH took girls to bed and I quickly hung elves from my washing that's drying (hate having washing drying indoors). Girls were not quite in bed and DD1 went back downstairs to get something. She rushed back up saying 'The elves have moved already, I have ruined it as they know I went downstairs, then DD2 went to check too.
It all for brushed off very easily with oh maybe they went back early and she said she felt bad she saw them before morning.
Now I'm not sure whether to move them again or leave them