This should walk through how to configure package details to appear in the comments section of the Magento Order Details page. Keep in mind you need to have dimensional packing Enabled in order to toggle yes or no.
3. Click Apply to save this setting.
Check Order Details Page in Magento
1. From the Magento Admin Panel, navigate to one of your orders in Sales > Orders
2. Click open any order that processed after the setting above was changed to yes and you should see package information in the comments section at the bottom.