He hasn't had all of the negative feedback removed. It appears that 7 feedbacks may have been removed.
From what you show in the "before" screenshot, all of the visible feedbacks were complaining that the Unsearched rolls did not have the rare coins the buyers were hoping for, but there was no guarantee in the listings of what coins would be included, they were described in the title and description as unsearched. The seller has received good feedback for those listings as well, so the buyers may have lost if they tried to file a Moneyback Guarantee case.
https://pages.ebay.com/help/policies/defect-removal.html
Automatically removed
We automatically remove defects, adjust your late shipment rate, and remove feedback when:
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We take action against a buyer for violating the Buying Practices policy.
We take action to close an eBay Money Back Guarantee case or appeal request in favor of the seller.
The sellers offers a 60 day return policy, with a restocking fee. It's also possible that the buyers wanted to return the items, but were not willing to pay the return shipping or restocking fee. They may have threatened negative feedback if the seller would not pay for the return. That would be feedback extortion, which is against the buying practice policy mentioned above.
http://pages.ebay.com/help/policies/feedback-extortion.html
Not allowed
Examples of Feedback extortion
The buyer can't threaten to leave negative Feedback or low detailed seller ratings if the seller won't:
Accept a return and pay for return shipping if not covered by the original listing or eBay Money Back Guarantee.
Give a full or partial refund for an item if not covered by the original listing or eBay Money Back Guarantee.
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