In the script you can see the name of the item - it is the 'PandorasGiftBox'. It does not seem to be on the list you posted.
[add PandorasGiftBox should add the box. Then you can set the properties to be one per character, one per account. And fill the box with whatever you want them to get.
ServUO - [https://www.servuo.com] Version 0.0, Build 0.0 - Build on 2000/1/1 0:0 0:00 UTC - Release
Everything else works right? May not be a big deal, but something looks wrong there. Why is there no date & time, or build info? I have never seen that. It should look something more like this, I think -
ServUO - [https://www.servuo.com] Version 0.5, Build 7698.28707 - Build on 28 Jan 2021 15:56:54 UTC - Release