DBCC SHOW_STATISTICS command (find out if an index has had its indexes updated or not)
If you want to find out if an index has had its indexes updated or not, you can use the DBCC SHOW_STATISTICS command, like this:
DBCC SHOW_STATISTICS (table_name , index_name)
This command will not only tell you when statistics were last updated, but also provide you information on the kind of statistics that has been collected for the index you are examining.