Japanese Crystal Birds, inlaid with gold leaf

I have 5 crystal birds, about 2 &1/8th in. long. Each has a sliver of melted gold leaf "floating" inside the glass. They are secured in a box that resembles a book. The box exterior is lined with painted cloth and bares a white strip of paper with the Japanese symbols (translated) "Glass Artisan". On the bottom edge of the box is a small paper tag with the letters, M I - 3A.

The interior of the box is white satin where the birds rest in small slots.

I would like to know how much each bird could sell for, and the box. Or as an entire set.

Thank you!!!