try the following:
app.activeDocument.activeLayer.groupItems.left = 200;
Sorry, my original post had a typo... I was actually using "pageItems", not "pathItems".
Since a groupItem inherits from pageItem, your suggestion behaves the same way.
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For folks who're interested...
I ended up taking an entirely different approach:
Instead of moving the logo group, I decided to leave it alone, and move the artboard instead.
app.activeDocument.activeLayer.pageItems.resize(50,50); app.activeDocument.artboards.artboardRect = [left, top, right, bottom];