I was hanging patio lights on my deck and looking straight up. I saw two objects, highly reflective and square shaped flying due north at about 4000 ft. A commercial aircraft flew the same path about 5 minutes later and I checked it’s altitude on flight radar. The squares rotated as they flew and were totally silent leaving no contrail or exhaust. The sky was mostly clear with a high cloud ceiling just west of my location. There were no birds and no other aircraft at the time, only the commercial jet that followed later. I ran to get my camera but by the time I returned they had vanished.