This is only a guess because i was once interested in the foreclosure sales and was looking at them closely for awhile. On the OCC you can track when the contract went into foreclosure. There are ways to pull up the outstanding loan and fees for that contract, but I don't believe that you are responsible for all those fees and outstanding balances. It seems like a really slow process because a contract could have been put into foreclosure in 2016 and I'd see it go up for auction in 2018 - so with that i guess you could assume there might be 2 years worth of dues owed.