Editing large collection of items

We have 969 items that were imported as "private" and we would now like to make them public. Is there an easy/fast way to change this setting for all items? So far we know how to edit all results on a page (10 items at a time) but that doesn't seem very efficient.

Easiest thing would be to bump up the items per page under Appearance -> Settings. It would be too much churn to try to show all ~1000, but I've been able to do between 50 and 100 per page. Also, on the browse items page, make sure you use the filter so you only show the private ones.