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This is a simple little Treasure Chest.
I used 8mm x 2mm magnets on both the chest and lid. I place them opposite poles when I glue the magnets in so the lid will only fit one way.
You can find the magnets here: https://www.amazon.com/gp/product/B077KYBYYY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1