Brilliant uncirculated basically means that the coin has never been carried around in your pocket, slid across the counter, touched by your hands too much, or spent in daily commerce. As you have found, these small varieties really don't have a hobbywide appreciation. There are collectors out there looking for these, but the numbers are pretty small.
First thing that I recommend, is visit your coin shop and purchase a few 2x2 cardboard holders. Put the coins in these holders to ensure their continued condition. DO NOT touch them any more than you have to. Hold the coin by the edge. Your fingerprints will KILL the value.
Once you have the coins properly sealed, store them in a safe place until you decide what to do with them. If you choose to sell them, look for dealers who specialize in these coins, as they pay more money for them. The online auctions will give you a basic idea of the value.