Mainly because I'm one of the few people still submitting things into the database. I decided to submit early when the system was still new, so I did not have the full picture at the time. The DIA entry is 80% there, but there's still a number of talkgroups out there that were never identified.
36300-36308: Baggage talkgroups
36353: In the "Customer Service" Range
36514-36517, 36520: In the "Maintenance" Range
36553: DIA DFD 4
36554: DIA DFD 5
36559-36562: Probably DIA DPD stuff, but almost never used.
36607, 36615-16618: In the "Operation" Range
36702-36703: In the "Radio Shop" Range
38801-38811: New patches to analog frequencies used at the airport.