A client received a 1099-B. 

The form shows gross proceeds and cost for US Treasury bills.

At the top it says "Transactions we do not report to the IRS - non-reportable proceeds and cost basis information  The last column header says "difference" instead of gains or loss.

I've never seen this type of reporting before.  Do I report it on schedule D like usual?  Or not at all? I tried searching on line but most of what came back addressed interest income and not this.

Any help would be much appreciate it.  Thank you.