Financial information would not be purged by Blackbaud. If you or other Sphere users on the account have not reversed financial transactions, please check the following: 
  1. Confirm that the record wasn't merged with another record. If so, check for the gifts on the other record.
  2. Make sure that the record wasn't entered with a spelling mistake.
  3. Confirm that the record wasn't entered under the donor's Maiden Name.
If you have checked the above areas and you still cannot find the transactions, Chat witht Support and reference this article. .