Missing Knives

My kids were playing with my butter knives this morning. I didn't think much of it. I was busy doing laundry and tidying up the house because a real estate agent was bringing some buyers over. Anyway, I cannot find the knives anywhere! I have no idea where the kids put them, but I have one knife. There are 7 others stashed somewhere. I am sure I'll find them when I least expect it, but in the meantime ...