Sounds like it was the medical report.
The FA told the wife "he was a paid FC passenger, but we issued him a voucher, so he'll be okay" and had the form in his hand. Hearing voucher, and seeing the paper...didn't feel like leaning over to read.
Only reason I heard any of this was the headset jack was acting up and cutting out every 30 seconds...and not a great time to fish for another headset.
And yet again, an incredibly great crew service-wise. Worth every penny of extra fare over the competition.