I'm no expert, but I wouldn't expect them to ball up because they're cold. That works for us because we're warm-blooded, but I don't think it would do anything if you're (more or less) the same temperature as your environment.
It can be a defense mechanism, so maybe it was scared or otherwise unhappy, but sometimes they just hang out like that. I guess that's a comfortable position if you're a fat little snake, haha.
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