Afaik, he first wasted the majority of the scrolls on unsanctioned (though some were actually sanctioned by the general behind the ruler's back) minor goals but the remainder was lost, yes.
All in all, it was an experiment in trust that ended badly and I've not been willing to relinquish control of magic since, despite not at all spending enough time on it myself. My obsession with non-summoning scrolls doesn't make it any easier.
And then I didn't even mention the heavy opposition that rises at every whisper of magical organization. It usually results in a strong-worded discussion between equally stubborn sides. And ends there.