You can try calling the listing agent and asking them why the carpet was removed. The better question would be why the previous offers fell through, and if it was due to financing, why didn't the financing go through.
If there is a known issue (referred to as a material adverse fact) affecting the property, a licensee must disclose it, as should a seller. However, REO sellers and their listing agents seem to be immune from this rule, so even if they do know something is up with the property, they most likely will not disclose it, even if they should.
So basically, it's up to your own due diligence to determine if there is an issue with the basement flooding out and any issues (i.e. mold, especially in the drywall) caused by the flood, as well as any other defects in the property that would influence your decision to purchase. Be sure to read the terms of the auction, because in most if not all cases, you have to make all inspections you deem necessary BEFORE bidding, at your cost, even if you do not win the auction. If you make a pre-auction offer and it gets accepted, you may be able to make the offer contingent upon a satisfactory home inspection and not chance the home inspection money for nothing.