You've seen them in any number of catalogs, those clever devices for hiding keys. Some are shaped like rocks. A fancier one looks like a ceramic turtle. Now R.C. Steele Wholesale Dog Equipment and Kennel Supplies catalog offers "A Pile of . . . Key Hider." According to the description, you can slip your keys inside this pile of dog excrement and "put it in the yard, near the porch, or in the middle of the driveway. Who would think to look?" The "Piles of . . . " retail for $3.76 each; if you order six or more, they are yours for $2.96 each. As for myself, I will hold onto my keys and suffer the consequences.