Was it a DIY divorce so he would not have had to provide copies of tax returns to her through his lawyer, who might still have them?  Was he self-employed in 2014?  Is he sure he had a profit that year?  He can't use the wife's income for the NOL refund.  Were they preparing their own returns (and not keeping a copy)?

I don't know that transcripts will help, since they won't show how much of the tax is attributable to each spouse.