@JeepPilot
In one of the cases I know of, some family members of the owners who had not paid taxes, came forth and stalled the proceedings a bit claiming all kinds of things. The sale of the land went through in the end but in the mean time it was a headache.
Buying a house in auction can be really interesting-------squatters and adverse possession. It goes on more than people realize.
Regarding finances, laws vary all over the place . It is about how much deposit must be made to be able to bid. Some places require cashiers check only. Other places will accept a certified check with other papers from the bank including a signature guarantee medallion. Not everyone that works in a bank can give a signature guarantee medallion.