I followed your advice. Google Earth still only shows for each of those corners the N and W coordinates. So I'm assuming I report the N coord for the extreme North and South points and the W coord for the extreme east and west edges?
In GE, mouse over the lower left corner of your map and you will have the South and West boundary, then mouseover he top right and you will have the North and East boundary.
Yes, if you area of interest is in the North Western hemisphere, GE is only going to report North and West coordinates. The lower left corner is both the West and south bounds, the top right corner is the North and East bounds.