What Can I Realistically Do About My Packages Being Taken From My Apartment's Mailroom?

About six months ago, I ordered a package that went missing. I initially thought the apartment management might have misplaced it while cleaning or something, but to be safe, I filed a police report. I figured it was a one-off incident.

Then, about four months later, I ordered a Squatty Potty from Amazon (I hope they’re enjoying it), and again, the package went missing. Amazon being Amazon, they replaced it with little to no fuss, so I didn’t think much of it. I didn’t bother filing another police report and just went about my day.

A month ago, I ordered a pretty expensive gift for my dad—a specific rangefinder for golfers that he really wanted and that I couldn’t find locally. I ordered it, requested photo confirmation for delivery, and crossed my fingers. The day came, the photo showed it was delivered, but when I checked the mail—no package. I filed a police report again and moved on.

Now tonight, my girlfriend was excited about her Book-of-the-Month delivery. We got the delivery confirmation, went to check the mail, and the package was gone.

I know I can keep filing police reports online, but it feels like they just disappear into the ether. We keep to ourselves in this community—we don’t party or even really use the shared spaces—but at this point, I feel like I’m being targeted and I need this to stop. Our mailroom isn’t open to the public; you need a key fob to enter. So I’m certain it has to be a resident here.

Thank you in advance for any and all advice.
Location: Oakland, CA