Coffins (caskets) dream meaning is explained below using 1 different source. Each interpretation is shown with its source.
Interpretation 1 — Michael and Elizabeth Thiessen
Should you dream of a well appointed coffin and it is empty then does this show that you will soon lose a close friend, (not necessarily through death, but rather, death of a friendship).
If you see a body in the coffin you will soon have sadness, but if the person in the coffin is the dreamer then is this a contrary dream and the dreamer can expect some very good luck.
Source: Encyclopedia of Dreams • Author: Michael and Elizabeth Thiessen