BTC Vault does not include a local copy of blockchain.info (as this side requires a server) but only a link to it.
Ah, I was remembering some method that their HTML page with javascript allowed offline wallet access.
I guess the script to decrypt a wallet might work instead to provide offline access to a blockchain.info AES-encrypted wallet. Perhaps that would make a useful addition to a future release?
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https://gist.github.com/fcicq/3368495