Last week i threw out 2 x 2kg boxes of weet bix ( Australian type of breakfast cereal) which the chickens devoured in no time flat. The next day i awoke to find one in a layer box that my girl 'big red' had left me, it was also a double yolker. Just lucky 'Big Red' has a body shape not too...
I have a Rhode Island Red hen called 'retard' due to her previous moronic ways. Once she reached 6 1/2 months though she just snapped out of it, maybe she her brain was just a bit slow to develop.
Golf balls worked for me aswell, i put about three in the laying boxes about a month before hand. My first girl 'Road Runner' took the hint and layed her first egg in the laying box, a few days later i removed the balls and the rest of the girls that started laying after that knew where to do it.