When/How did Eligius "indirectly cost MTGOX many thousands of bitcoins"? From the forum:

Eligius already will accept any transaction, &quot;standard&quot; or not,
without bias.
...
Indeed, and Eligius' willingness to do so indirectly cost MTGOX many
thousands of bitcoins when a software bug caused them to send some
weird transactions that Eligius mined.

Can anyone provide a reference that explain this incident? When did it occur?
It refers to an occurrence in October 2011 when someone sent a lot of bitcoins to an incorrect public address: someone fucked up and lost ALOT of money . Casascius stated that he thinks it was done by Luke-Jr's Eligius mining pool: Re: someone fucked up and lost ALOT of money


  The way I understand it, these transactions were nonstandard enough
  that normal miners and clients would already refuse to relay or
  process them (but will accept them in a mined block). And that the
  only way these got into a block was that he teamed up with Luke-Jr's
  Eligius mining pool which has been modified to explicitly allow these
  nonstandard transactions for a fee (or other negotiated arrangement).


Earlier from the same thread, Re: someone fucked up and lost ALOT of money: 


  Maybe this helps. It seems MtGox made a mistake somewhere.
  
  
    MagicalTux: that's a problem, but not the worst problem we ever faced
    
    MagicalTux: all the broken withdraws have been re-issued
    
    MagicalTux: just spent one week of BTC-only income