No problem, I'll try a bit on my own for a while..thanks again..
EDIT: Okay, I tried dumpprivkey XXXXXXXX on all of those and got nothing but

"Private key for address xxxxxxxxxx is not known (code -4)"
Am I correct in assuming I should be doing this with the wallet from which I sent the 13.612 BTC?
Where did all these addresses come from, I don't recognise any of them.?
ANOTHER EDIT: This is so confusing. I entered a few of them into blockchain as your recommended and got lots of weird transactions that I'm sure I didn't make.
I wish I was a rocket scientist, this stuff is beyond me..
EDIT: Okay, I tried dumpprivkey XXXXXXXX on all of those and got nothing but

"Private key for address xxxxxxxxxx is not known (code -4)"
Am I correct in assuming I should be doing this with the wallet from which I sent the 13.612 BTC?
Where did all these addresses come from, I don't recognise any of them.?
ANOTHER EDIT: This is so confusing. I entered a few of them into blockchain as your recommended and got lots of weird transactions that I'm sure I didn't make.
I wish I was a rocket scientist, this stuff is beyond me..