2 ways…

Go in to Batch edit
Filter for all the items you wish to change or for all items

Click on Item traits
Click on green button that says

Edit traits for all filtered items

Either add or change the trait to New (this will take you through the traits for every item filtered or every item if you did not filter)

Since the condition trait is not in your listings, it did not come over in the import, therefore by default items with no condition attribute is listed as used.

2nd way…which might be faster

Go to Batch Edit
Search Optimize
Filter (if needed) and Select all the items that you wish to change
Go to the top of page where the 2 boxes are that [URL removed]

Add search [URL removed]

Remove search [URL removed]

you will have to remove the [[[URL removed] (in this exact form)

then Add

[[[URL removed] in this exact form

Make sure you selected all the items you wish to change (do a test run with 1 or a couple first if you want to see how it works)

Then Click on Apply Changes

When all done, be sure to go back to Add/Edit and hit the Update booth