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My ancestry is mostly colonial American back to the 1600s on both sides with a few 19th century Irish and English immigrant ancestors; I have 22 matches on GEDmatch above 40cM and maybe 100 or so above 30cM (for comparison I have 3700 matches at 20cM or above on Ancestry).

The most likely reason for this is that they are from a population not well represented in GEDmatch; my experience of genetic genealogy databases is that the vast majority of testers are in the USA, and the longer one's ancestors have been in North America, the more matches one has. If you're a...

Not so much, just pointing out that a GEDmatch "ethnicity" chart is not in fact very useful for determining the likely ethnic background of these people because many Northwestern Europeans will have very similar results. It's very likely to be similar to within 5 percent or so for most people of...

Or not; this is K13 for a French-Canadian from Quebec (this is why I say K13 is fairly useless): And on edit, K36 map for the same French Canadian person:

DNA "ethnicity" results are unfortunately not especially useful, because there is significant overlap between populations; the genetic distance between most Western European populations is small. Eurogenes K13 on GEDmatch is especially not very useful. Eurogenes K36 is probably better for giving...

It's entirely possible that they were reported missing; depending on where they were from the missing persons report may have just been local (if they were from the west coast or Canada? Slim chance of a sheriff's department in South Carolina finding out about it back in the late '70's...

Following on from a post on the last thread where someone says "I haven't been able to find an exact match for John Doe's watch", and speculation regarding possible counterfeits, I present the following, which I found in literally 30 seconds after doing a Google image search for "Bulova Accutron...

the CODIS database uses STRs ("short tandem repeats") at 13 (pre-2017) or 20 (post-2017) sites in the genome. the GEDmatch database uses an autosomal profile that consists of anything up to a million SNPs (single nucleotide polymorphisms). A GEDmatch autosomal profile will return matches by...

This seems pretty unlikely for a couple of reasons: firstly, the boots, Canadian-made Kaufman Badlanders (trademark registered 1976, after this Mansfield's disappearance); secondly, the pen (bearing the name of a business from Detroit) which had an American flag on it, suggesting it might've...

The lettering on the pen is clearly worn off; METACORE would look like FTACORE if the M and the bottom part of the first E were missing.