That’s a great idea that would work for tuma. It won’t help for unkosher foods. However I would assume that the soups that were put into these cups, came from a ladle that was put into a soup pot that was off the fire. In that case it wouldn’t be an issue. Otherwise if you poured straight out of a boiling soup pot into the cups, it would be unkosher. However if you’re Sephardic, then these cups would still be ok because the main/usual/majority use, is for coffee and tea which from your question, it sounds like they were always kosher.
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