Legal Question in Landlord & Tenant Law in Oregon

Have you told your landlord this? I'd put your concerns in writing and see if it doesn't stop. Your landlord probably thinks that he or she is doing you a favor. Your landlord shouldn't be entering your dwelling unit without permission or notice, and you may be entitled to statutory damages (plus any actual damages, which your question doesn't address--presumably all of your packages are making it to you safely). But if your main concern is to see the behavior stop, I'd try asking first.