At this point I can only speculate App Store has another database hidden somewhere in the system or online or maybe it is checking the /System/Library/Receipts folder.
The longest stretch I'll make is to say that /System/Library/Receipts seems to be the only common thread between Sierra and High Sierra, but its functionality may differ between the two.
Or, concisely, "Got me beat!"
Last edited by artie505; 01/28/1810:08 PM. Reason: Rewrite
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