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The bolt rolls from right to left, and falls into an appropriate hole. I find this an example of a really simple yet clever engineering. Animation here: https://www.reddit.com/r/3Dprinting/s/C3BI8xoW8q

These tins are for different cuts of tuna. The packaging is cut to show the area of the fish in each can. It’s hard to tell in the photo but the lines are actually perforated so it’s functional too. The same packaging can be modified for different tins/different cuts of tuna.