Where did the eggs go?

My latest dilemma is that the egg count has dropped and I don't know why.  I've also seen yolk on some of them, so I'm guessing that some are being eaten, but not sure on the rest.  I think I have two choices for attempting to solve this - 1)they really seem to like a lot of straw in the boxes, so I'll just add more, and 2)the nesting box I made them is supposed to be a tilted rollaway one, so I simply need to tip it so the eggs roll down safely into the storage area and *voila* no broken eggs.  I will try the extra straw today and see what happens.