Well after a bit of research I think I have found the meaning of the symbols on these sheaths. They are traditional Tibetan buddhist symbols (there are mongolian and sanskrit equivalents) known as the Eight Auspicious symbols. In general these symbols occur all together or in pairs or singularly and are often found on religious objects or objects of personal significance.
Starting at the bottom of the sheaths shown we have in order:
A Wheel, A Banner Proclaiming Victory, An Endless Knot, A Conch Shell, A Lotus, A Treasure Vase, A Pair of Golden Fishes and A Parasol (Umbrella).
Each of the symbols is steeped in Buddhist meaning, for those curious it can be further explored at this link.
http://www.exoticindiaart.com/article/symbols
DrD