Car Key Got Stolen, Apartment Told Myself And The Cops They Had No Idea Who Stole It Then Later On Confronted The Person About It

I moved into my apartment October 7 and on October 8 at 2am, my car key and subsequently car got stolen, the apartment told myself and the police that it was a non resident. Which seemed fishy to me because I accidentally left my keys in the door knob, so it had to be someone that had access to the fob required building and elevator to steal the keys, I also found the manager very fishy from the start, she kept arguing with me that I probably left the key in my old apartment and I shouldn’t speculate, I just moved to Portland so there was no other apartment. The next week I decided to break my lease and the apartment had me sign a waiver saying I can’t come after them, if I broke my lease rent free. I wanted to consult a lawyer but I was going to work and dealing with the stress of a stolen car so when I would leave work the law offices would be closed. Two days ago I found my car and yesterday I signed the waiver. Then the cop called me after I signed the waiver telling me that the manager contacted her that they know who stole my key, it was a resident, and they confronted the resident about it, but the cop would need a subpoena to get the residents name.
I just think it’s insane how the whole thing played out, confronting the resident, knowing I live alone, and they might be crazy enough to come after me, not contacting the police about the information that they knew until I signed the waiver.
I need advice and please be polite.
This all happened in a month time frame so they had two weeks to tell the police but waited..
my insurance also refused to pay for the car while it was stolen, and now that it’s recovered, I had to pay the tow fee, to rekey etc, so far I’ve paid 1k.
Do I have a case? Should I consult a lawyer?
Location: Portland Oregon