S.F.
funny how you can tell exactly what a kid has eaten just by changing a dirty diaper. When my daughter was that age we would find all sorts of stuff in her stools... carpet pieces, foil wrappers, beads, once even a lego man head... i never could figure out where she got them to eat them, but alas, there they were. Thank goodness she never hurt herself. Crazy kid! :)
no worries though, your boys will be fine.