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SelectivelyAvailable posted on r/whatisthisthing6w
It looks like the right size and shape for a homemade rack for Nespresso Vertuo pods. Is there a coffee machine setup nearby? Similar to this, but with the pods standing vertical in the slots. https://www.walmart.com/ip/Galvanox-Wall-Mount-Organizer-Designed-for-Nespresso-Vertuo-Pod-Holder-Modern-Acrylic-Shelf-Holds-5-Pods-Box/3023544090