(Disclaimer: The following is a very short summary of my understanding of Missouri Law.  Don't rely on it. )

The Collector in every County in Missouri holds a sale of properties each year on the fourth Monday in August.  The Collector offers for sale properties that are two or more years overdue in State and County taxes.  Property will not be put up for sale if the owners pay their taxes first.  Purchasers usually get a "Certificate of Purchase."   If the property is not redeemed within one year and the purchaser does a bunch of required paper shuffling, including a title search, he can get a "Collector's Deed."  If the purchaser does not complete the required paper shuffling in time, he loses all rights to the property.  He must find out what needs to be done and do it. Or, he will lose everything.  See Chapter 140.
 
My understanding is that folks with Collector's Deeds should give Quit Claim Deeds when selling that property.  But, for about $1,000, many lawyers will help with a Suit to Quiet Title, which improves title enough for sellers to give General Warranty Deeds with title insurance.   See an attorney for more info.

For more info about Missouri State Tax Sales see:
Your County Collector's home page.
The Missouri Statutes on line, especially Chapter 140.
An attorney.

The property descriptions on the PROPERTY LIST show the kind of title I possess.  "Collectors Deed" means I have done the required paper shuffling and received a Deed from the Cape Girardeau County Collector.  "Warranty Deed" means either:
1) I bought the property from an individual who signed a Warranty Deed, or
2) I bought the property at a tax sale and successfully completed a Suit to Quiet Title.