the money order deal might work as well. u can get up to 2999 at each location without showing id. if u get lucky and find a clerk that does not know the rules, u can get even more.
here is the problem with the money order scenario. there is a chance your fedex will be intercepted in route to its destination overseas. if so, the "financial instruments" inside will be seen. if they are blank money orders, they viewed as the equivalent of mailing cash overseas (against fedex rules and against the law if more than $10,000). even if you make the money orders out to someone, a record will be kept of your packages contents.
since most money orders are not international money orders, not sure how cashable they are at a foreign bank. not saying they are not cashable but i have noticed that books always seem to insist upon a cashiers check instead of a money orders.
You do have couple of other options. First, you could take a vacation to CR, Antigua, etc. Costa Rica wairfare is substantialy cheaper that other offshore locations and actually a pretty cool place to visit. If you bring a friend, you could easily bring the 15K with you.
You used to be able to send $999 Western Union without id. Have not done it in a while, but have heard that is no longer possible.
If you live near the Mexican or Canadien border, you could send western unions from there. Less rules for id, and you can even use the blue form (much cheaper).
Your best bet is still finding an agent or big player to do a cash transer with.