A nine letter word meaning a place where coffins are stored could be mausoleum.
he was placed in 4 coffins
It is the place where grain is stored.
a place where data or specimens are stored and maintained for future retrieval.
A place where books are stored for easy use and lending to the public.
If you mean the random event, you have to look at the grave-stones then look inside the coffins to see if they match, if they do, place the coffin inside that gravestone.
This place was used as a place where the Ancient Filipinos washed their dishes or a place where they stored their pots, pans and other cooking utensils. But I'm not sure.
l for locus
Change one letter in mint to get a word meaning a place where money is made?
vault
Coffins, six feet under the ground (in a graveyard usually).
mountain?
Venue or Abode?