You should post this on eKarting News as well – they have a forum for lost/stolen items that seems to be pretty well monitored nationally (http://ekartingnews.com/viewforum.php?f=35). I’d also keep on top of FedEx as well – it wouldn’t be the first time their tracking system said something was delivered but was still on a truck somewhere…
Hope you guys find the engine… and whomever is responsible for it missing.