Apparently they did collect fingerprints, hair, and DNA from Zeb's car. According to the article below (I know it's old ... 2009) they collected DNA (later said from Misty) for comparisons; but, I haven't seen any results from that.
October 16, 2009
ASHEVILLE — Police recently retrieved hair, fingerprint and saliva samples from a friend of a man last seen at a South Asheville convenience store nearly a decade ago.
Police as of now do not consider the 28-year-old West Asheville woman a suspect or a person of interest in the disappearance and suspected homicide of Zebb Quinn, Asheville police spokeswoman Melissa Williams said in an e-mail Thursday. The Citizen-Times is not identifying the woman because she has not been charged or identified as a suspect in the case.
Police collected the woman's DNA for possible future comparison to other samples, Williams said. Detectives collected 50 head hairs, fingerprints and mouth swabs from the woman on Oct. 8, records show.
“As the Cold Case Unit reviewed this case file, they noted that we had not gotten a DNA profile from her. We had obtained DNA profiles from most of the rest of his social circle years ago,” Williams said. “There is no new evidence and no new leads. This was routine review of the case file and detectives looking for any unfinished work.”
http://unsolveditn.blogspot.com/2009/11/asheville-police-collect-dna-in-zebb.html