Sadly it seems that Bingi is indeed [url=http://www.geocaching.com/seek/log.aspx?LUID=03845f98-15ea-4f83-b13d-3daeb17b2106]missing[/url].
As the owner, you can officially mark him as such -- his page remains live and if he does surface at any time in the future, his recovery can still be logged.
If you aren't familiar with how to mark a bug missing - there is a dropdown beside 'Recalculate distance' on your travelbug's page. Use this dropdown and you will see the option to 'Mark bug missing'
Fingers crossed that he does turn up one day. We have seen other lost bugs mysteriously show up again.