The thing is, vultures are as common as crows here. They are literally everywhere. As a local, I do not think twice or even once when I see vultures wheeling overhead anywhere, and I most definitely never think "Must be a dead human." Any time there is a dead thing, there'll be vultures either overhead, or lurking on the ground nearby (because they don't stay in the sky, at some point they wanna eat), and because we have soooooo much wildlife, dead things are also everywhere. Roadkill, things that failed the food chain game, critters that got poisoned or died of natural causes, and so on. I personally don't put any stock whatsoever in people's vulture sightings or lack thereof when it comes to a case like this, but that's of course JMO, MOO, etc.