> This is present even today, I saw a burial in Eastern Europe where the parents put a game of chess and toys in the coffin. While it will do no good to the deceased my theory is that it is a way for the living to deal with the loss.

Spoiler: they do that so that future grave robbers and archaeologists will know all about the dead person's lifestyle. Surely that kind of everlasting glory has to be worth something to the deceased, one would think?