So back to the original post, I don't see any cards listed in the 1960 Topps Pop Report on the SGC website that mentions a blank back. It may just be lumped into the VG 3 category as a standard card.
So it looks like you can go to the card in question, right click on the "566 Hank Aaron All-Star" line and select "Report an Issue." Then in the dropdown, there is a slot for "My card doesn't appear to be in the Pop Report." Fill out the information and maybe SGC will contact you when they break it back out into a Blank Back variation.
I reported one (listed as 350 Mickey Mantle Commemorative Reprint) to ask why a reprint was listed in their 1960 Topps set Pop Report. So we'll see how long it takes for them to fix.
Checking the cert lookup, that is correct:
Quote:
SEARCHED AUTH CODE: 1381910-034
SET: 1960 Topps
CARD #: 566
SUBJECT: Hank Aaron
DESCRIPTION: All-Star
GRADED ON: April 2016
GRADE: 3 VG/40
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Nice to see the "Graded On" line as well. That should help out the BODA guys...