Base Table from SSIS Package

Hi,

   In My company, we having many SSIS packages altleast 250+. Some of the packages using some base tables and creating one table.

Example: table names "1","2","3","4"   and "x"

   The "x" table getting data from "1","2","3","4"

Is there any way to find the base table names used in SSIS packages? Please let me know.