Please follow the below steps in order to locate your Etsy Shipping policy template ID.
Step 1: Login to your Etsy Shop Manager and navigate yourself to the shipping profiles page.
In-line with your shipping policy profile, under the Active listings column, you'll find all the Etsy items that are using the template (digit will be hyperlinked). Simply click on the number.
This will open the Etsy Listings page where you'll find all the items that are using the Shipping policy.
From the web page URL, locate the shipping_profile_id: (refer to image below)
This is your Etsy shipping policy template ID.