Not every will brought to court gets approved. Wills that are denied should be included in the probate file along with a notation that they were not admitted to probate. There may be testimony regarding the will and why it was considered to be invalid. Or there may only be a statement regarding the denial. 
Sometimes reading the denied will makes it clear why certain heirs might have had a problem with it.
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Just found my 5th g-grandfather’s will (it was approved) and it is a treasure trove of family information. In 1787 he gives the married names of all his daughters, mentions some grandchildren by name and gives names to all his slaves.
That was a fortunate find.