iWork documents can be lost by various reasons :-
- Accidently deleting the documents.
- Improper formatting of the drive containing the drives.
- Loss of file due to invalid cut – paste operation i.e incomplete file transfer.
- Due to Virus, trojan and malware issues.
- Abrupt system shut down while working on iWork.
Note :- When you discover any file missing then stop further use of your system drive which is containing the file otherwise there is a danger of permanent deletion of that file.
The best thing will be if you had created a back up of your document files other wise you can use iWork recovery software. This an advance tool to recover and restore your lost iWork files in mavericks. It will perform a full scan on your specified drive to retrieve all the deleted and missing files and provide you a preview so that you can choose them to restore. The software can also recover the files you were working on and could not save it due to above mentioned reasons. You can download this software to retrieve lost iWork documents on Mavericks and they will ready to edit.