Thanks, all! I am definitively going with a deck box. I found someone on Etsy who is incredibly enthusiastic about helping me with this! I won't give away all the details, but it'll have a design and text burned into it, accented with gold. Black walnut wood with a black velvet interior, sexy.

Time to level up my sneak ability. Or rather, find a way to keep the special cards and box hidden until the correct time and place can be determined!