I am closing this thread pending an investigation of the seller's license to sell these ROMs:
You can only sell what you legally own:
You may only sell what you own, or have been authorised to sell. In regards to software and firmware devices - unauthorised copies are not permitted to be sold on AmiBay. In particular, there is no legal definition of the term 'abandonware'.
Programmable 'Firmware' devices
Please note that 'Firmware' devices containing software code are subject to the same rule of trading as ALL software on AmiBay.
Firmware is that part of a programmable medium which can be used for storing startup or any code indicative to the operation of a system-
This covers ROM, PROM, EPROM, Flash and Microcontroller technologies.
To openly trade in these items, you must ensure that you own the code / software that is stored on these device(s) or provide them as blank / empty for future programming.
You can only provide programmed items or offer a service to program this technology where you are able to provide proof that the code or software programmed is in either the public domain / open source, or owned by you as part of a transferrable licence.