UPS Fails Hard

I’ve been expecting a couple packages the last week or so and, to my surprise, today I received an interesting little postcard from UPS. Here’s what it says: We are unable to complete delivery because:CORRECT STREET # NEEDED. NOT DELIVERED. The curious part? The postcard came to my mailbox, the same address the package in question should have been delivered to. So, the question of the day is: how did they manage to deliver the postcard to me and not the package? Clearly they know where I live… And you thought USPS was bad.