Where two people challenge the validity of the Get: Gittin 9a
Where the ex-husband challenges the validity of the Get: Gittin 9a
Her financial status if he threw the Get to her in a manner of uncertain validity: Bava Metzia 12b
Responsibility of a husband to give his wife food if he threw the Get to her in a manner of uncertain validity: Bava Metzia 12b
Where a Get was lost, and then found immediately: Bava Metzia 18a-b
Where a Get was lost for a long time: Bava Metzia 18a-b
Above, if the loss was in a place of caravans and the name is known to be common: Bava Metzia 18a-b
If the husband delivered the Get, saying "You are divorced," and then the bill is found to be blank: Gittin 19b
If the husband said, "This is your Get" and then destroyed it [post-delivery]: Gittin 19b [2x]
If the proxy lost the bill and then found it tied or sealed, or among his own vessels: Bava Metzia 27b