Unfortunately only one star for the lunch box. Sus...

Unfortunately only one star for the lunch box. Sustainability is a necessity and not only to advertise big things on the packaging. I wanted to order a replacement sealing ring for my lunch box. There is not any :(((((.
I was generously offered a new box, but I don't want a new box, just a spare part (which would only cost a few cents to manufacture).
It would be great if customers could buy spare parts in the future (for the otherwise great products).
TOO BAD!!