In The Shadow Rising we have this quote from Egwene:
Two recovered meant that eleven still with the Black Ajah (pg 198 kindle)
They have recovered two of the ter'angreal the Black Ajah had stolen, and from my understanding the 13 Black Ajah members who left the Tower took with them 13 ter'angreal. But what about the one Perrin broke, the hedgehog? Does Egwene not know Perrin destroyed one? Was that one not part of the 13 stolen?