Okay. Due to the age of the wiki, it doesn't actually have the starter templates I was referring to (Template:MessageBox (download export) and Template:Hatnote (download export)). You can either copy the legacy versions of these templates or you can copy the UCP versions from a newly created wiki. In the case of copying just the base templates, I believe the legacy and UCP versions are still identical. The links I have provided are for the legacy versions of the base templates. If you click the "download export" link, it should download the XML export of the template and the necessary dependencies. You can then simply import them into your wiki using Special:Import. That said, you may want to take a look at them first just to make sure you are okay with them.