Personally, I think they might just take it after trying, and failing, to come up with a good lie. Cause if more people knew that it would grant you any wish, more people would want them, so they probably aren't going to do that (well, Goku might, but Bulma would try to stop him and maybe succeed). And they could probably get away, Goku preoccupying us while Bulma makes a escape, and then jumping on the Flying Nimbus and leaving us in the dust.I, I feel like I can just trust that our character is smart enough to not be misled or anything. They are going to have to explain why they want the ball if they expect us to give it to them, which means they have to either explain what the ball does or have a very good lie ready.