Visualize new list items after import

Hello,

We have a list of Skus that is the child of a Packaging list. Each packaging has multiple Skus.

Some Skus are old and are no longer active on our production lines. We have a module made of boolean line items to select which skus are "used" currently. 

When we update the sku list with new skus, by default that "used" boolean is set to False. So we have to go through the list of skus to kind of guess which ones are new and should be set to True. This is pretty problematic because it is easy to forget to check.

I do not want to reset the boolean each time to True because I cannot go back each time to uncheck all the old ones. 

Any ideas on how to handle this?

Ideally I would have a way to clearly see which skus are "new" and need to be checked or not.

Thank you for your help,