Which work items were deferred?

I know there's a Deferred Work Items report which provides a chart
showing the number of items deferred from a given iteration.

I think it would be very beneficial to be able to see exactly which work
items make up the data in the chart. We'd like to be able to see which
work items have been deferred. Is there any way to see the chart data?

Any other way to query or find out which work items have changed their
Planned For value?

Thanks!