It's a little red waterproof case about two inches long, one inch wide and 3/4 inch deep. It looks like this:
Name:  Petzl-eLite.jpg
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It was lost somewhere between the southern end of Two Trees where it crosses Mainline, up Cedar Run, part of Southern Traverse, Lloyds, and then up and out Cascara to Mainline and parking lot. I have the light, but not the case. I at least have the important part of it!

If someone finds it, let me know!