I reran sfc /scannow... and there are only a few "error" entries remaining:
2021-01-01 19:19:32, Info CBS Failed to get visibility for package: Package_for_KB2887069~31bf3856ad364e35~amd64o~6.1.1.# [HRESULT = 0x80070490 - ERROR_NOT_FOUND]
2021-01-01 19:19:37, Error CBS Failed to verify if catalog file \\?\C:\Windows\Servicing\Packages\Package_for_KB3004394~31bf3856ad364e35~amd64~~6.1.1.0.cat is valid. [HRESULT = 0x800b0100 - TRUST_E_NOSIGNATURE]
2021-01-01 19:19:37, Error CBS Failed to internally open package. [HRESULT = 0x800b0100 - TRUST_E_NOSIGNATURE]
2021-01-01 19:21:22, Info CBS Failed to get visibility for package: Package_for_KB2887069~31bf3856ad364e35~amd64o~6.1.1.# [HRESULT = 0x80070490 - ERROR_NOT_FOUND]
2021-01-01 19:21:27, Error CBS Failed to verify if catalog file \\?\C:\Windows\Servicing\Packages\Package_for_KB3004394~31bf3856ad364e35~amd64~~6.1.1.0.cat is valid. [HRESULT = 0x800b0100 - TRUST_E_NOSIGNATURE]
2021-01-01 19:21:27, Error CBS Failed to internally open package. [HRESULT = 0x800b0100 - TRUST_E_NOSIGNATURE]