[quote=@Burthstone]
Yes, but you said before Wizard X has significantly more.

He isn't detecting it in your normal wizard fashion. He's using his energy control magic to 'poke and prod' if you will, and can get a sense of how much they keep stored at a time. (Second Origins get automatically included in this.)
[/quote]

True, but how does he know it isn't depleted a lot? 

But it probably isn't. There is a lot of magic being stored for about *looks at watch* a year later.

And while I'm Edolas, isn't constantly depleting magic so that's also a plus xD