Aren't they little stinkers? Taz used to do that ALL the time until I figured out his hiding spots. Usually I'd walk around calling him and then all of the sudden he'd appear just sitting there looking at me like "what's all the fuss about?".
Taz can also open the cabinet doors under the sink in the back bathroom that we don't use but the toilet in.

I'm so glad he was still in the house though. Whew!