a lot of people don't do backups often, specially now thanks to HD wallets not forcing you to make backups more often. He probably doesn't have a backup that has the private keys for the recent addresses.
Time Machine on my Mac keeps, in practice, a copy of every version of every file. And although I seldom use Windows, I remember having run into a similar feature there. But of course, if the OP doesnt do backups, then theres nothing to restore.