Using GarageSale Version 7.0.14b2 (830), macOS Version 10.12.6 (16G1212)
From the GarageSale Help:
To easily jump to the original of an item displayed in a smart group, right-click on it and select “Reveal Original”.
When selecting this command from the Contextual Menu, it DOES “open” the Original item’s parent group folder, but it DOES NOT “select” the Original Item.
It should also scroll the list so the Original item, which is now selected, is visible in the list.