This is not my droid, but its a real sad story. Help @chrisfbartlett(his twitter handle) find his R2! If anyone sees it on eBay/craigslist message him, it's stolen goods! It was stolen from his garage before Xmas. Just keep your eyes and ears peeled. You can also email him here: chris@TK409.com
I'm not sure of his location, this was posted in the astromech.net forms. I'm just hoping he can be found and returned, I know I'd be heart broken if this happened to me.
he's probably keeping a low profile. a new droid in public can't be hard to miss and the R2 community usually knows who has a completed or near completed droid. Anyone who has built one usually posts of their accomplishments at some point.