This list is for MPs whose belongings — such as identification, purse, cell phone, etc. — turned up alongside the road after they disappeared. (I didn’t count cars though.) I actually did a list of this recently, but just for cell phones; I decided to expand on it.
This seems to me like a pretty good indication of foul play: either the MP was forcibly abducted from the roadside and dropped the items during the struggle, or whoever harmed them tossed the incriminating things out their car window. I mean, no one just voluntarily leaves their wallet or their phone in such a place in an ordinary situation.
The part of Ohio where I’m from used to be pretty much all swamp. They drained the swamps by digging ditches. There are ditches pretty much everywhere, on both sides of the road. They fill with stagnant water sometimes, or the grass in them grows knee-high. If someone threw something out the window, there’s a good chance that it wouldn’t get found for months or years, or maybe never.