Imo, it's unfortunate that an innuendo was posted suggesting that Purolator no longer made Bosch US made filters. There was and still is no citing to the extraneous comment implying that Bosch's sale of it's half share of Purolator to M&H, who already owned the other half, means Purolator no longer make Bosch filters, and further that Bosch may now no longer be made in the US.
As I said on that thread, the current Bosch Distance Plus and Bosch Premium still say made in US, and are made by Purolator. Lacking authoritative information to the contrary, citing preferable, I take anything else at this point as unconfirmed hearsay.
Also said, much as K&N and MicroGard left Rank/Fram/Champ and Bosch left Champ in the past, Bosch would be more free to look for another manufacturer. But, at this point I've seen nothing indicating that having occurred or about to happen any time in the near future.
All things considered though, not very surprising that the very broad 'departed' term would spawn such unproven speculation.
As for the comment above about the Bosch Premium's new box saying 99%, afaik BP has always said 99% not 99.9%, even as Bosch switched from Champ to Purolator as manufacturer.