Ouch.
I have never used the Buddy Tracking on mine, but it might be something to look at if you have used it, yours was recently lost, is still on, and you have a friend with and Alpha unit.
After you find it or get a replacement, you might consider a holster and or lanyard setup that attaches it to you in a way it can't easily be lost. I use a custom leather holster from Wingworks with mine. The indian head snaps and bird dog stamp were my addition to it, but the rest is as I ordered it. I use a leather belt loop with D ring off my belt or clip it on a D ring on the shoulder strap of a vest, a pack, or a hydration pack.
http://wingworks.biz/wingworks-leather-holsters-for-garmin-astros-and-alpha/I'm getting an Alpha next week. How did you get the leather stamping on it? That looks cool.