I just found an old wallet on a recovered crashed drive from 2012 with almost 20BTC worth of unconfirmed satoshidice transactions. I looked them up in blockchain and there's no record of them having occurred, with the client's blockchain fully updated
hate the break it to you: the 20 BTC in your wallet is undependable. the transactions have not confirmed since 2012 and are not in any client's transaction list. unless they're in a block, you can't spend them.
How would I determine if this is the case and what's the best way to attempt to recover them?