How to fetch content ID generated after running the Mass Create Printable Page Performance Documents

We are migrating the performance documents form an old fusion environment to a new one since we cannot load the item level ratings we are planning to load print of the evaluation document as an attachment in the new environment. We have a scheduled process "Mass Create Printable Page Performance Documents" which will generate PDF of all the performance documents in the review period. After running the process, we are not able to generate the performance documents individual PDFs, but we observed that once the process is run there is a Content ID generated for each performance document using which