The untraceability of bitcoins is one of their biggest features. allinvain spent months looking for his 25k btc... it's impossible to recover. Sorry man.
Allinvain didn't lose any bitcoins. I'm about sick of people saying he did. He didn't even mention the alleged fact on his own blog AT ALL. There is no evidence it happened in bitexplorer.
He's a liar.
http://alansmoneyblog.com/2011/06/