I can answer this question, although you may have already found the answer in the last 3 years...there is absolutely no guarantee that NamUs will automatically match a missing person to an unidentified person based on the information provided; that is done manually by an actual human being once a potential match is recognized and investigated. NamUs does not have a way to automatically search fingerprint or dental codes. NamUs employs forensic odontologists to confirm or exclude possible matches, but the matches must be found by us, the public and the professional users. As you can see in NamUs, there are some potential matches listed based solely on the information that's inputted into the NamUs UP or MP profile.
One thing to remember is that NamUs is a website in which missing persons and unidentified persons profiles are stored and added for comparison purposes. The University of North Texas is closely aligned with NamUs, as UNT's DNA lab does lots of work for many states throughout the nation who need DNA samples processed. NamUs and CODIS are not the same thing.
CODIS (Combined DNA Indexing System) is the national DNA database where all DNA profiles are uploaded and compared to each other on a weekly basis. NamUs does not store actual genetic profiles, it only notes whether or not the DNA profile has been completed and uploaded into CODIS.
As someone who has worked to identify skeletal remains for over 2 decades, I can tell you how frustrating it is to not have a "national dental records database" or a "national personal tattoo database", or a "national serial number on hip replacement database"...you name it. You'd think we could come together and compile that information to bring resolution to families, but databases like that just don't exist at the moment. I hope that helps. Keep up the searches and the good work!