In the Interim Process for Drawbacks User Guide there appears to be an excel sheet attachment for the Template at the very end:

However, when a user clicks on the icon, the template does not open.
CBSA has advised that this template can be found here, in a separate document called Drawback Submission Template, shown in the screenshot below.
Link to the list of User Guides - https://ccp-pcc.cbsa-asfc.cloud-nuage.canada.ca/en/onboarding-documentation

Link to download a copy of the Drawback Template - Drawback-Submission-Template---Modèle-de-soumission-de-drawback.xlsx