My brother is a missing person in Tacoma, WA—can you help us find him ?

There is an active missing persons case. My brother is an adult male missing in the Tacoma, WA / JBLM area.
He was reported missing by family on Friday. The last confirmed in-person sighting was Tuesday around 2:00 AM, and the last known phone contact was Tuesday around 3:00 PM. He lives in Tacoma and was in/around JBLM earlier that week.
Family and close friends are very concerned because:
He has not contacted anyone since Tuesday, which is out of character according to those close to him.
Friends found a 30-day eviction notice on his apartment door.
Some valuables, including a gaming computer, were still inside.
Local police have reportedly done welfare checks.
There may have been interpersonal conflict involving people he had recently been around.
There was mention of a possible flat tire and an unknown person supposedly coming to help him, but that detail has not been confirmed.
He drives a golden/tan mid-1990s Lexus LS 400. 1 am intentionally not posting the plate number or private contact information here.
Family is trying to understand what practical steps they can take next, especially regarding:
confirming whether he has been entered into the national missing persons system,
getting his vehicle/plates checked through proper channels,
whether phone ping/location data can be requested by law enforcement,
what information should be provided to police, and whether there are local Tacoma/JBLM resources or missing-persons groups that may help.
We are taking all Reddit input with caution and will go through official channels, but any general guidance from people familiar with missing-person cases in Washington State would be appreciated.
Please do not speculate wildly or harass anyone. The goal is to help family/friends get the right information to law enforcement quickly.