Dude, get the address of the house. It is probably a PUBLIC AUCTION.

Then try to find the house in public auctions websites.

The guys who you contacted, are just AGENTS. The make a commision should you bid the house and win it (if you register under them). Agents are everywhere, and they can provide A LOT of other services too (like checking for caveat, bills etc etc)

Considering the sum is BIG, (410k), u can even ask agents to split their commision with you just as long as you register under them. Try and get a flexible agent.

But a friendly warning lah, buying auction props can be a hassle.

Cheers