[Exhibitman]

Without knowing which state it is impossible to say. If you operated a business during the marriage in a community property state the income may be community and the cards bought with it might be a mix of community and separate assets. Even if not the card income might be considered for purposes of establishing support.

Assuming the asset is truly separate, you should react as you would if any third party had possession of a corporate asset. First demand (not ask) for the cards. Judges really like to see efforts to resolve things before running to court. If you are reasonable and she is not that carries weight. If asking doesn't work go to court and get a writ of possession as an officer of the corporation and/or sue her for conversion.

This advice is completely gratuitous and I don't represent you so you need to go to your lawyer.