@edesen have you disabled the powerup in the board? Also you can revoke the token from within your Trello settings:
However also note that Cardbox will have had to go through a very rigorous security assessment to get the ability to connect to Gmail directly. I had to do it as well (my app BenkoBoard/BenkoDesk requires even more permissions). The process cost a lot of money and took a long time, it was very thorough.
Gmail has done a lot to increase their security following on from some early missteps where they had some pretty egregious data leaks.
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