During phase 4, fsck(1M) discovered that the specified file was orphaned because the inode had no record of its path name. In other words, the file was not connected with any directory.
Answer "yes" to reconnect the file into the lost+found directory. Then contact the file's owner to ask if you should send it back, and where to place it.
For more information, see the chapter on checking file system integrity in the System Administration Guide, Volume 1.