Praise be to Allah.
So long as this CD is the property of your first wife, then you must return it to her unless you are afraid that this will cause problems, in which case you may give it in charity on her behalf.
The scholars stated that in the case of items of low value -- even if they are seized by force or stolen -- if it is too hard to return them to their owner, they may be given in charity on his behalf. It says in Mataalib Ooli al-Nuha (4/65): If a person has in his possession something taken by force and does not know who the owners are, or he knows who the owner is but it is too difficult to give it to him, and it is of low value... Then he stated that he has the choice between handing it over to the ruler or giving it in charity on behalf of the owner.
So you have to give this CD as a gift to someone who will benefit from it and the reward for that will go to its owner.
And Allah knows best.