Sheela, I might have disrupted mine when redoing the little areas behind the patio rocks... if they pop up I will let you know and save bulbils for you this fall... but you shouldn't count on that. I'm pretty sure I can tell them from the wild onions, because the walking onions have wide, thick leaves.
I didn't particularly take care of mine, because I never really found a use for them. Did you cook with yours?