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I SO "enjoy"your questions ... dya mou !!! ... ... ...
Your "number 1" was one of the things I, too, wanted to "clarify" ... a "Greekism" ... ... ...
... "but (what on Earth) am I doing ?!? ... the fool ?!? ..."
(Sounds a LOT like me, actually !!! LOL !!!) ...
Your "number 2" ... as follows :
- η κούτα - οι κούτες ... "carton box" / "carton boxes"
- το κουτί - τα κουτιά ... "box" / "boxes"
AND ... watch out for those accents !!! ... LOL LOL LOL
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