to note that the 1099 refers to an IRA look for a check mark or "X" in the box.

"IRA/SEP/SIMPLE" is the name of that box.

If it's not clear whether or not that box is marked, ask the payer.  That box should be marked only for distributions from traditional IRA accounts, including SEP-IRA and SIMPLE IRA accounts.   For distributions from 401(k), 403(b), 457(b), federal TSP and non-qualified annuity accounts, that box should not be marked. 

The IRA/SEP/SIMPLE box has to be marked to be considered "checked".  Usually with a X entered in the box