How to undelete all posts by an accidentally spam-cleaned user

[Edman]

A moderator has accidentally "Spam Cleaned" a user with 1300+ posts.

I have lifted the ban, but the posts remain soft deleted. I have searched high and low, and I can't find how to recover all his posts. If I go to his user profile, "Postings" and click "See More" I can see a maximum of only 400 posts.
How to undelete all posts by an accidentally spam-cleaned user

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