Went over to the Llano Elementary yesterday.  Was not expecting to find much as I hunted here rather often.  I recovered 1 quarter, 1 nickel, 3 pennies, an electrical box popout disc, a broken zipper pull, a length of copper wire, a length of aluminum wire, some sort of electrical part, and a RING.   The ring has no markings but is sturdy and well made so I think it is silver plate.  It is nonferrous.   While a different part of the playground, this is the same location where I recovered the mood ring earlier.