Yup, I added in the game's description that you should click boxes, but in retrospective I should've highlighted and/or displayed some arrow on the boxes.
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Hi, thanks for your comments. Indeed my game could use a lot more feedback, but I mostly ran out of time and energy to properly add that. As Creus pointed out there's a stockpile (a stack of boxes on the right side of shop) where you can see all the items you have (and can order more).