I had bought something for the kitchen, the company sent the wrong item, I was going to send it back (all agreed with company). Now I have discovered that someone has taken it out of it's packet, I don't think I can return it now. The place that I put it is one where I think it unlikely that anyone other than dd1 did it - she is nearly 8 but prone to fiddling with things which aren't hers. Ds couldn't get it and dd2 wouldn't be likely to do it, it is also right by where she sits. It costs about 5 pounds. It will not be her only present, but is it unreasonable to tell her that as it is because she opened it, it will now become hers and she might have less other things as a result?