The Ga believe that the dead go into an afterlife and the coffin acts as a sort of house so they must be living in style!
http://www.ghanaweb.com/GhanaHomePage/NewsArchive/photo.day.php?ID=52081&VOLGNR=5
Above is a pineapple coffin! Winners of coffin design competitions can earn between 5 and 6 million Cedis (or 500-600 US dollars).
It appears that these coffins are made out of wood, so the coffins unfortunately would not preserve in the archaeological record. If the Ga could find a bog to throw the coffin into then it could preserve but I'm not sure if coastal Ghana has that kind of climate!