I read a post a few days ago about the kryt and how there is a large arrow pointing to the big door in the back.
You go to krypt BJ and focus on all the lit coffin including the torches burning in the back.Every coffin that is lit is larger than the rest and they arch.All the krypts can be bought except one.
I think all the coffins should be left alone until you have the right key and money to unlock all the ones that make the big arrow