There should be a property information packet of some kind, maybe even with pictures? No? Nothing? No auction information about the property? That seems unusual too.
1. Want to see it prior to contract/bid? Ask. If it's occupied that could be the reason but (a) perhaps these are cookie cutter homes and there's a model you can see? If not see 2.
2. Won't be stripped? Ask what's included in the sale, and make sure the specific property is in the contract, and that there will be a walk-thru prior to close to verify the property is still there.
3. Ask how you're supposed to bid sight unseen? Or whether the auction house will guaranty there is no damage? Ask. If so make sure the contract will reflect that, and if not, you need to consider this in terms of offering a discounted bid.
Having been on the selling side of distressed property auctions in the last couple of years, believe me it's usually a yes or no deal with NO attorney review allowed (although some wiggling can occur for closing but don't count on it).
Go to the property at a reasonable time on the weekend and tell the renter what is up and that you would like to look at the property and keep him as a tennant!