Most likely, the IRA was consumed by liquidations before retirement.
Click here for more information about liquidations
To see if that was the case, look at Forms & Reports > More Reports > For Planners > Liquidations to Cover Negative Cash Flow. If there are any numbers in the section labeled :IRA/401k distributed,” then this is what happened.
For account-by-account detail of the liquidations, look on that same screen, further down, for IRA/401k Liquidation.
For a complete report on details of IRA inflows and outflows, see the report labeled IRA/401(k) Assets.