Bexar County previous unresolved lien issue at closing

[Asad Halai]

Having difficulty with a property we bought at the sheriff's auction (county tax auction) in Bexar county (TX). At closing the title company cannot find a lien release from 2009 in the amount of 64K. That is drawing the very anxious buyers away and need some advice/help. Is it not true that the county's lawyers send notices to all lien holders prior to the sale and if they do not come forward the liens are considered null and void?