Step 1: Visit MicrosoftStore.com.au
Step 2: Select your Surface Pro 4 model of your
choice and click ‘Add to cart’
Step 3: Select your Surface Pro 4 Type Cover of
choice
Step 4: Click ‘Review and Checkout’
Step 5: Click ‘Do you have a promo code?’, enter the
above promo code in to the field, and click ‘Apply’
Step 6: Proceed through the checkout process
Limit 1 per customer
I just realised that this could be targeted. Feel free to test it out