Understand the database is populated by the general public and its not an official list, its generated by all of us tuning in and figuring out what it is we are hearing.
Far as any digital we don't have, for the radio shack brand add a wildcard. That way you will get every talkgroup on the tower your receiving. When you hear something compare it to the MPSCS list with link below and if its not there, you found a new one! Then you'll need to help identify who and what it is used for and once you do let us know with a submission to update the database!
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For the Uniden model owners change it from ID Scan to ID Search.
If all you northern MI listeners can look over your areas and let us know of any additionals we don't have, items that are no longer in use, PL codes, etc. We don't get many updates from listeners in the northern half of MI.
Here is the state, click your areas for the analog frequencies we have
Michigan Scanner Frequencies and Radio Frequency Reference
and then the MPSCS digital here -
Michigan's Public Safety Communications System (MPSCS) Trunking System, Statewide, Multi-State - Scanner Frequencies