For evidence of this I think the archaeologists should focus on finding the holes in the corners of the mustatils where they planted their tiki torches used to

For evidence of this I think the archaeologists should focus on finding the holes in the corners of the mustatils where they planted their tiki torches used to guide those UFO pilots home. Maybe all the goat, cattle, and gazelle heads is just evidence that aliens are only interested in the rear portions of earth's animals. That would bolster my personal theory that earth is nothing more than a training ground for alien proctologists and gastroenterologists. Their first visit convinced them that there was nothing here but a bunch of assholes so they decided that in spite of that there was still something they could learn here.