Found a similar thread where adding a wizard on closing the print form worked, but something changed in 10.2.700, and it no longer works: Disabling Prompt "Is this Packing Slip Ready to Ship" - #9 by askulte
private void PackingSlipPrintForm_Closing(object sender, System.ComponentModel.CancelEventArgs args)
{
// Add Event Handler Code
oTrans.GetType().GetField("ReportPrinted", BindingFlags.NonPublic | BindingFlags.Instance).SetValue(oTrans, false);
}