First of all DO NOT GO THROUGH ANY AGENT. Probably all of them are fraud stars. They will take money and simply vanish. It happened to my friend. There are agents who will inform u about auction property and charge u only after the deal is sealed, they are probably a bit genuine ones.
Auction properties are advertised on news paper by banks. They do not go through any agent what soever. I inquired it from all renowned banks. If the agent is asking 20% in advance before even letting u to see the papers, it is 100% sure it is a fraudulent agent.
Banks will let u see the papers and property urself, only difficulty is they will not give any copy of it officially. Some banks will allow u to take pics of the papers in ur mobile. Banks do not take any money before hand. If u want to take part in the auction, deposit the prescribed amount (small amount) to the bank after filling up the auction form from the bank itself. This money will be returned to u if u don't win the auction.
Once I went to an auction "agent" in CBD Belapur. I asked the most basic question: "Mr. Agent, I don't mind how much money u r making out of this deal, but first show me some evidence that the property that u are showing is really under auction." He simply backed off after some fooling around. I immediately realised that he was a fraud star.
No bank gives loan on auction property even on provisional basis. Not even on its own auction property. That speaks about the amount of risks involved on auction property.
U never know what litigation are lingering with the property and its very difficult to find out because there is no centralized/computerized database in India. A large proportion of properties on auction went into the ordeal because of litigation itself on the first place. U will always miss something and repent for the rest of ur life.
If u still decide to buy an auction property DO NOT GO THROUGH ANY AGENT AT ALL.