Ooh, it depends on how long that they were dead and buried for, because no matter how well they were embalmed and how good of a vault and casket was used, there is still going to be decomposition. Most of the time, most people wouldn't want to do this,, due to the really unpleasant look and smell of a decomposing body. Also, from what I have heard, even twenty five years ago, the way that burial vaults seal, in order to get the lid off to be able to remove and open the casket, you practically have to break it apart. So, a new vault would have to be purchased and used for a the casket to be relocated and buried in. Why somebody would want to do this after a period of years I don't know, for there wouldn't be many remains to be seen, only a skeleton.