how do i find out what mortgage is on foreclosure auction?

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my partner told me to find out how much is on the mortgage because i am going to a foreclosure auction on monday.  i am registered to a website that gives all the auction dates and where it is at and the attorney office etc.

i dont think it tells me where how much is on the mortgage though.

and why would it matter how much is on the mortgage for a foreclosure? i thought the bank is just trying to make back whatever they can at this point