Any questions or issues, please e-mail me unless they don't contain sensitive information and you can post them here without any foreseeable negative consequences.
To get started, go to http://www.feshrine.net/scavenger/
If you get stuck on a certain one, let me know here. Just say "I got stuck on #___", meaning you couldn't get that code but got the ones before it. If enough people get stuck/it's not obvious enough I might give a better hint or something. (The first one could be potentially tough if you don't think of how you can submit stuff to me via the FEShrine... *totally just made the hint slightly less vague*)
With that, good luck!
The prize is a custom member icon of any capacity that doesn't otherwise break forum rules. In addition, it has to be of modern quality, so no magazine scans from 1989.
-Shu
Update: To make this more fun, we're going to have multiple winners. The #1 winner is Ryoku, who just one. He has won on route #2, and there can still be a 1st prize winner on route #1. For 2nd place route #2, I'm offering up any member icon of a Fire Emblem character--meaning you've got a little less freedom there. Said icon may eventually turn into an icon that multiple people can use as well because it's tough work on Shu here XD. Same for 2nd place route #1.
Therefore there are 4 winners, 2 1st-places for each routes, and 2 2nd-places. Also, the scavenger hunt will be up for a while yet if you just want to try it and have fun.

1st-Place A Route: kirant
1st-Place B Route: Ryoku
2nd-Place A Route:
2nd-Place B Route: Oblivion Knight