Obviously it seems impossible task and they are trying to avoid getting attention due to some odd reason. I thought of adding it here, since others could contribute probably next time someone searches through bitcointalk, they could actually find this thread and stay away.

I did not send anything, but tried registering with dummy emails and the btc address seem to be new for every user. So there would not be any record in blockchain. The valid transactions that was listed might be totally be someone else's transaction history that these people found out somehow.

We should probably have a sticky thread that lists strange websites like this which newbie's ought to stay away from. 

Got this from one website with ads and seems right one for this:

Beware of any kind of scam and pay attention every time you spend your money! If it's too good to be true it probably is.