as far as game genie goes, I can't help you, I even looked on google. and the only codes I could find where the ones that you said you have already done.
do the earthbound Game genie codes not work?
and the greetings page is is in the earthbound central discussionviewtopic.php?f=2&t=8&start=100
right there yo!
so post there, and you might get a cookie