Your key pairs are still valid, though, and they're in the backed up wallet. If those 9k were purchased and a few confirmations were achieved, then everyone with the current block chain will recognize your keys.
That the client is problematic doesn't mean the data/$ is gone.
Except he doesn't have the keys, because the transaction generated a new keypair for the remainder left post-transaction. The new key didn't get backed up because it didn't exist at the time of the last backup.
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Your key pairs are still valid, though, and they're in the backed up wallet. If those 9k were purchased and a few confirmations were achieved, then everyone with the current block chain will recognize your keys.
That the client is problematic doesn't mean the data/$ is gone.
Except he doesn't have the keys, because the transaction generated a new keypair for the remainder left post-transaction. The new key didn't get backed up because it didn't exist at the time of the last backup.