You could try finding changed config files by running:
sudo debsums -ac
Note that this won’t catch all. There are files that packages install and don’t touch afterwards. I my case for example it does catch that /etc/gdm3/custom.conf
was modified to enable autologin among other things.
And they managed to do that with those lazy US workers? Wow.
E: folks, pls look up TSMC bosses’ statements on American workers’ ethic