I'm not 100% sure on that. With a high-metabolism snake like my garters, I'd say the searching behavior is less an indicator of stress than with the BP since they spend more time in the wild out and about. I also think social behavior is a bit more advanced with them since they are one of the only species that seem to actually calm down with cagemates; they will actually follow me around (inside their tanks) to beg for food.
With the BP I tend to see the searching as more out of stress since she'd be spending all her time under a rock basically in the wild. Plus, they're solitary except for breeding.
I don't know with 100% confidence that those are the exact motivations behind the behaviors, but it's a pretty good educated guess.