How do I do this?

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I have been planning this. Like a girl would plan a wedding. ( I know I'm crazy) but I had this idea to put everything themed in a shadowbox(positive pregnancy test onesie a nicknack with said theme) or keepsake box with glass or see through lid to give to my fiance when I do get a bfp. I bought a picture frame shadow box just to see if it would fit. But it's all kinda crammed in and a pregnancy test totally wouldn't fit. Any ideas on what to use and where to get it?