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So given what is produced it seems like there are a lot of variables being generated when a sandbox is created. How is it possible to get this degree of an exact match between the two? I mean even in just the npcs alone there has got to be hundreds being created. How can they ALL be the same? The odds of that just seems to be incredibly unlikely. How is that even possible?? lol

When a random generator is using the same seed value, it will generate exactly the same content. But yes, that is an extremely unlikely scenario. Consider yourself extremely lucky :)