I saw a video how to make an open faced shadow box.
items used:
2 - 8" x 10" Picture Frames
School Glue
Extra Strength Glue
Brackets to hold frames together
Paint
Lightweight cardboard
1 page of scrapbook paper 8" x10"
Scissors
Items you want to put into shadowbox (Collection of insects, Collection of flowers)
Can you find the written directions and vide again?
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This isn't a video but the directions are clear: https://debbiehodge.com/2010/02/make-a-shadowbox-from-dollar-store-frames/
Hope it works for you.
It sounds as if you already have the most important part, the materials list. I suggest that after you seal and brace the two frames together, you go back and reseal from the inside. You don't want any light to creep in the sides, ruining your deep shadow box effect. Best wishes!
Thank you