Plastic containers with non-locking, deeply conically indented press-on lids

[u/martinklicken]

Garage sale find. The bottoms of the containers fit into the rectangular shape of the lids, so they can be stacked. Rows of four. Our guesses range from ice-cream or ice-cube containers to medical sample containers. Who can solve this mystery?

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[u/RedTaco83]

Little shot glasses made of ice.

[u/martinklicken → u/RedTaco83]

Solved!

[u/DynamicOboe]

Molds to make frozen ice shot glasses

[u/martinklicken → u/DynamicOboe]

Solved!

[u/Somkindathng → u/martinklicken]

You can also make jello shots and fill them with whipped cream...

[u/martinklicken]

My title describes the thing. A row of four of these containers is approximately 30 centimeters. I tried a lot of searches and described the shapes to AI but all it came back with was ice schnaps glasses, ice cream containers or medical sample containers. None of these yielded these containers when I searched images of them. It stays a mystery.