Here’s a quick walkthrough of how to set up an Automation using the Append last checked by script to automatically attach an interactive ‘checked by’ box to the nominated topics created by the users at the set Trust Level(s). It’s really useful if you have any documentation or policy topics that you’d like to visibly show the last time they were reviewed and who by, and also uses the local dates functionality so each user can see the checked date in their own timezone.
There aren’t a lot of moving parts to this one, but you do get an impressive feature once it’s set. If you navigate to your Automation page and select the script ‘Append last checked by’ you’ll be presented with these options:
There’s only one trigger for this, ‘After post cook’, and you would then enter the categories and/or tags you’d like it to apply to, as well as a Trust Level for whose topics will be eligible for the check box and who can perform the checks (a topic created by a user not included in that setting would not get the ‘checked by’ added).
There is also a handy way to add a category + all of its subcategories. If you start typing the category name of the parent category you should see an option similar to this appear:
Selecting that will populate the box with all of them, so no need to laboriously select them all individually if you have a lot of them. 
Once this is set, all topics in the categories or tags that are created by users at the set Trust Level(s) will now have this box attached to them, which can also be marked by anyone at the relevant Trust Level(s):
And that should be that. 
If you have any questions please ask them below or spin up a new support topic.
This also works really well in conjunction with the ‘Last edited by’ Automation to provide more comprehensive editing and review information. It works in a very similar way to this one, but you can read more about the details here - 'Append last edited by' Automation