This is just my attempt at contributing here. I went through the search link posted by nhbenz and dug through all the posts I could find. Of the 17 people I found who had found some variation of these, I was able to determine at least the state in which the object was found for 16. I also found the city for many. So I made a little map of where these have been reported. I put the dot near the city where possible, and otherwise just tried to put it near the middle of the state/not covering up the name. Other than the Kansas outlier I think this map shows an interesting pattern. Maybe it will help?
EDIT: I'm updating the map as people post here.
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