Alternatively, don’t spend any time out effort on that, except flagging/deleting spam, and take advantage of search functionality to immediately find anything you need later on.
Agreed on the calendar use though.
Also I don’t mean do any of that manually. Set a rule for tagging your boss’s emails as ‘boss’. You know you are looking for an email about tps reports. It was either your friend or lumberg. There are also other people who are emailing about tps reports. You can find it faster if you use the boss tag and it was actually him