I have a very similar story to yours, the fact is that they were testing mnemonics in early May of 2010, I logged into a web service then to be greeted with a mnemonic string.
I do differ in that this wasn't the only thing I was given as mine involves PGP..
Even with massive help, we are left trawling archives for lost concepts and code which has certainly been intentionally removed or lost, changes in op-code structure prevents recovery and the key players won't help or respond, they make out that you have likely been taken for a ride, which on study of our files cannot be the case.
Perhaps we can share findings privately? we relate to theUNIONJACK, we might not be that far away.
What web service was this? UnionJack has mentioned having a PGP key also.