CIG has announced that unclaimed codes for these two ships have expired and can no longer be claimed.

A theory posed by one content creator (Camural) is that this is due to the recent breach that CIG had where a list of codes like these could have been obtained by the hacker.

Edit - link to official Support Article:
https://support.robertsspaceindustries.com/hc/en-us/articles/42678242845591-Deprecation-of-Hardware-Promotional-Codes

The Mustang Omega:

The Sabre Raven:

The omega makes senses but the raven doesn't. Especially when they have been back to the wild recently

In what world does in make sense to end one but not the other?

These are specifically for hardware promotional codes. In the case of the Sabre Raven it would be from the Intel Optane SSD. The promotion for this ended in 2018.
https://www.intel.com/content/www/us/en/support/articles/000059982/memory-and-storage/client-ssds.html

Da Poets has gotten codes for raven 2 years ago:
https://x.com/DaPoets/status/1736279530246213973

So yes, they have had them in the wild recently.

The announcement doesn't affect hardware giveaways for the Sabre Raven. It's limited to the Intel Optane SSD promotion and AMD R9/R7 GPU promotion where anyone could go out and buy the hardware to get a code (at the time).

Edit: Although it's possible DaPoets used a code from the SSD promotion, I find it more likely that this code came from CIG specifically for the giveaway... I'll try to remember to ask him the next time I run into him at a Bar Citizen/CitizenCon.

Edit2: Nah, it's totally possible that the code there did originate from the SSD promotion. That being said, this announcement doesn't prevent CIG from generating new codes and renewing the promotion with Intel in a different way.