You can get the exemption number from the Material Declaration page by downloading the IPC-1752 version 1 or IPC-1752 version 2.
IPC-1752 version 1 is in PDF format and you will get the exemption number in the Homogeneous Material Composition Declaration page which under the Exempt column.
If you have downloaded the version 2, you have to use “Scriba1750a_beta06.jar” to open and view the xml file. Once you open the spreadsheet, go to the Product & SubProduct Information tab, then double click on Product, you may get the exemption number from the Homogeneous Material tab.