/data/report API question

GET/data/report/{id}?page={page}&count={count}&assetId={assetId}&startAt={startAt}&endAt={endAt}

http://secure.eloqua.com/api/docs/Static/Rest/1.0/GET_IOperationalReportDataService_GetReportData.htm

Where is it possible to find the "id" and "assetId" for the reports in Insight?

This hints at being a very useful tool but so far I have not been able to do much with it.

I've tried /system/reports however the data returned here appears to have nothing to do with the reports from insight.