It looks thirsty. Was the soil dry when you took it home? As long as the roots are okay, I would water. It might take a week or so to recover from its mistreatment. I'm amazed you found anything at a big box store. I haven't found a single hoya in months except a "Princess" at Walmart and I scour the stores every. Maybe you could take a decent piece and root it in case the mother doesn't recover.
