Missing Yarn

We just realized that the brown balls of yarn are missing!  We were looking for them so we could knit hats for our outdoor bunny friends, so they could keep their ears nice and warm.  The brown color would match their fur nicely, and would be all snuggly warm for them.  But the balls of yarn have vanished!  Do you think Brother could have suspected we might need them for something, and he hid them to prevent our using them?  We wouldn't put it past him.