You’re sister was going to buy a house without an inspection? Nooooooo. Very unwise move. However, with or without one, with your own eyes you should have seen the mold in the attic, crumbling foundation and where the elec box is located.
Nice humble brag re “ lovely handwritten note”.
I too live in a hot housing market in the NW. Nowadays, everybody writes a note involving new memories. It’s become de rigueur.