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T206CollectorSGC has graded 12 total N300 Bill Shindle Mayo's Cut Plug, including 2 SGC 70's.
Usually the argument in support of the PSA pop reports is that they have graded far and away more cards than SGC. With the N300 Shindle card at least, it appears the opposite is closer to the truth.
And there are 9 registered N300 sets on the SGC Set Registry, including 3 at 94% or higher completion.
http://www.sgccardregistry.com/index.asp?action=2&setcategory=1&setid=96
That's 7 more than PSA, and neither of the two at PSA have more than 73% completion.
http://www.psacard.com/set_registry/display_rsets.chtml?setid=392&set_name=1895%20Mayo%20Cut%20Plug%20%28N300%29
Given all of this, what is the possible relevance of a PSA population report for N300s?