Box shape, Large green and silent.

Before starting work at the Wyoming Valley Mall when I observed a large box-shaped craft moving from south to north. It made no noise and cruised at a slow but steady rate. It wasn't all that high and I could see it quite clearly unitil it flew out of site.
 It was a green rectangular box with a what appeared to be a red dome on top. It looked sloped on the side of the direction it moved in. No windows or doors. It stuck me as very angular and similar to a very large garbage dumpster turned upside down. I watched it in silence for a at least 5 minutes before running inside and finding another cook.
 He came outside and his reaction was: "What the hell it that!"  We both watched until we could no longer see it, scrathed our heads and went back to work.
Witness indicates that the date of the sighting event is approximate.  PD