Hi John, judging from the pictures, they look like new stock. No, mine weren't delivered with the 30923's. Not something that common, in my estimation. Nice of your seller to include them with your package. If you do decide to try them with your 288's, inform me of your findings. I have been pleased with my 1285-8B results with my 288's without 30923's, or variants, but always interested in possible improvements.
Regards,
Dave