If you can get in the house and it is in decent enough shape, proceed with the rest of your due diligence. Find out if the owners are willing to sell. If the owners are not involved (vanished) contact the lender about buying the property if they take it back at auction or the note and the right to foreclose before the auction.
Investing in foreclosure auctions is not a part time or even one-time endeavor. It is financially risky and you had better have an attorney that is familiar with the process and terms. Understand how the deed will be conveyed to you and what your rights and remedies will be after the sale has completed. To sum it up, in most states, NONE, its done, you own it, enjoy. If there are tenants in the home, they become your problem. If it is structurally deficient and uninhabitable, your problem, if it was a meth lab, your problem.
Please be careful.
The bottom line is you could get a great bargain or it could be a financial disaster. There have been times when the previous owners have totally trashed the interior of the house, even ripping out pipes and demolishing walls. So be careful.
I think buying an auction home might be better for as investment property rather than as your primary residence.