It is customary for the departing President to leave a letter for the incoming successor. Donald Trump confirmed that Obama left him a gracious note four years ago. This custom will not occur this year as apparently Trump's sharpie is out of ink.
I thought about baseball lore in the last century. Bobby Bragan and Birdie Tebbetts were playing musical chairs as baseball managers on short leashes. Mgr. #1 said when he first arrived he found two envelopes in his desk drawer. Letter #1 read "when things get tough and the heat is on "blame the press" - this will get you some breathing space." A few months later with the team in a deep losing streak with the management on his back it was time to open envelope #2 the contents of which read "It's time to prepare two new envelopes."
It does not appear that Joe Biden will find any envelopes in his desk drawer. tjs
