Almost midnight, two dark unlit objects, maybe boomerang shaped, flying close formation, glided by swiftly and silently

Saw another pair of unidentified crafts, this time dark, at night. No lights. Silent. Just quickly gliding by east to west around 11:45pm. Roughly shaped like bird or boomerang, black against sky, unmoving shapes-- no flapping, could not be owl or bat. Not crow or buzzard. Actual size unknown but I got the impression they were the size of really large birds. However did not fly at all like a bird, even in glide. They scared me. But not right away. They glided by 50 to 200 feet up impossible to know really, they took about 3 or 4, maybe 5 seconds to get out of my view. The sighting was so fast it was over before I could even really think. Instead of jumping up and trying to follow them visually I just sat there kind of confused. Like, what was that? When I finally did stand I realized I could have watched them for 2 or 3X longer. They were flying close formation and hugging the backyards, not going down the main drag nor my parallel street, but in-between. Medium high clouds, full moon but moon wasn't in my view yet. I cannot find an exact match for what I saw. I was out back watching for satellites. Saw spooky batarangs instead. Actually it was hard to make out any real distinct shape other than wide wings, short/no body. Creeped me out much worse than my daylight white orbs of mufon case 56662.