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Well, sounds like the people who have the snake right now are doing a decent job but I am sure there is much more you could improve to make the snake happier
First off, tank size does not determine how big the snake gets. How much you feed it does. You could probably feed the snake a small rat once a week. That is the schedule my adults are on. From what you described, it sounds like the snake is of a healthy weight. It is very rare for a ball python to reach 6'. I think females will get about 5' at their peak. This snake also might be male, which means it will stay on the smaller side.
If the snake was just fed, wait at least two or three days before you move it to a new home. Moving is very stressful for the snake and could cause a meal regurgitation if you don't allow the food to digest enough. One week from move day, you can offer food again.
When you get the snake, you should post a picture of the setup on the forum and we can help you tweak it to meet the snakes needs![]()