Although, it may need more time to judge correctly, this proposal seems to be broadly supported here. Before going on to a second, clearer proposal, I'd like supporters of this proposal to weigh in on what we have so far.
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1. The label of the proposed option (in order of my preference):
a) intentionally blank: evidence lacking
b) researched but unknown
c) no current documentation
d) continent/region unknown
e) not found
f) unknown
g) undetermined
h) no current documentation
i) unascertainable
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2. This draft Help text:
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Our community has agreed that almost any location name is better than no location at all. If you do not know the historically-accurate place name in the person's native language it is better to enter an uncertain, estimated, modern, or translated location name than to leave all locations for the person blank.
Birth or death locations should only be left blank when, after research, entering any location at all would be a guess. (See Help:Uncertain for more about the line between uncertain information and guesses.) In this case, choose the status option labeled "{label goes here}". This option should be used only when research has shown that there is no prospect of establishing and providing a source for a location, even a broad one like a continent (see below). To help other researchers, details of the research should be either mentioned in the main Biography text or added to the Research Notes section of the profile.
When both birth and death locations are blank and the "{label goes here}" option is not selected, a Data Doctor suggestion (141, 142, or 143) will be given.
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Thanks.
Edited to add placeholder text for the label in the Help text.