I will say that any opened bottle seems to seep over time. I wouldn't worry about leaks from new bottles, but I would be cautious about the storage of partially used bottles.
The thought never crossed my mind until I read here about instances of oil leaking from unopened containers. Rather than be concerned about it, I just put a tray beneath the stored oil.
What are the chances of a container leaking? Probably quite low, but I don't concern myself with probabilities. If I know that something can happen, I try to address it beforehand, and I truly do sleep well.
As for opened bottles of oil, there are non on my premises. The only opened bottle I currently have is in the trunk of my car, in a receptacle that can catch any spillage or leaks, and which is used for top-off oil if need be.