Department of Licensing
1125 Washington St SE
Olympia, WA 98504
Remove or invalidate the month and year tabs, bend the plates so they can't be used on a vehicle, and recycle them so they can't be confused with a valid Washington license plate. Don't put them in curbside recycling unless you contact the recycler first to see if the plates will be accepted.
Remove or invalidate the month and year tabs and keep the plates. They can't be displayed on a vehicle.