Received this from WA State Patrol, but I’m not a resident

Hi all, I’m posting here because I’m not sure where else to ask this. I found this postcard on my windshield today stating that I need to have a WA state license plate on my vehicle if I’m a resident of Washington and that my license plates have been entered into an investigatory file.

The thing is, I’m not a resident of Washington—I’m a resident of Colorado staying here temporarily as a full-time student. My permanent residence is in Colorado, where the car is technically registered in my mother’s name. I explained all of this in an email to the WA State Patrol along with a screenshot from my student profile stating that I’m a nonresident, which should theoretically clear my name according to the website on the postcard, but should I be worried?

I’m nervous to drive my car since apparently if an officer sees me in it I can be fined upwards of $1,100. Any other out-of-staters have experience with this? I can theoretically drive the car back to Colorado and leave it there if it’s really that big a deal, but I’d rather not.

Thanks so much!