You guys need to be careful with offers like this.

About a year ago there was a similiar offer selling some wallet.dat file that appeared to be corrupt and it was modified in some way so it looked like it had like 250BTC but in reality the output transactions were removed and it only contained dust.

I think some password recovery service looked into it and did a report on it. If you search you can probably find it somewhere on Bitcointalk forums.

So buyer beware.