When logged on to the storefront, navigate to the offer you're looking for whether by searching it's offer ID or browsing for it.
Click on the offer name or thumbnail which will open the offer detail page. From here, you can click the links noted below to view the RFQ and Proof for this product.
The RFQ/Proof attached to this offer would be for the handbook. If you were looking for the other products included in this offer such as the CBHI insert's RFQ, you would need to search the 1:1 version of that offer to find the RFQ/Proof.