I just went back and read step 3 of your instructions
Code:
3.) Inside your order_message.tpl file, locate the {/section} code (line 19 in my v4.0.14 file) and add a few blank lines inbetween that and the {/if} on line 18.
There you saying to put the google code AFTER the /section but BEFORE the /if. But now in this last post you said the Google code should come after both the /if /section.
Those are conflicting instructions. I am going to go test it the 2nd way and see what I get.