Pandora's Box?

This beautiful mother of pearl and abalone shell box was handed in to our church fête. Inside is a New Testament dated 1957 also with carved mother of pearl covers.
We priced it high but not unrealistically I don't think, with the knowledge that it was unlikely to sell - it didn't. I am now charged with trying to get an accurate valuation and hopefully also a sale, perhaps at auction.
It is a beautiful object and has obviously been treasured, so we feel obliged to try to get a good price for it so that the gift is used to its maximum benefit.