NOT A CAS+ - https://www.ebay.com/itm/Texas-Instrume ... 2606759957 - sent message asking for OS version on august 3. Seller will answer question on August 5. Seller does not speak English very well and seems to be confused as to why I am asking this :-p
Not Interesting
https://www.ebay.com/itm/Texas-Instrume ... 2411551364 - CAS+ 1.0.526/526/554, nothing special
https://www.ebay.com/itm/323339243860?V ... 3339243860 - sent message asking for OS version (twice; embarrassingly I thought it was another item but I had already asked months ago and forgotten). Seller said CAS+ 1.0.526/526/554
https://www.ebay.com/itm/Texas-Instrume ... 2340541474 - "00326 PVT1.1 S-0906" so probably nothing special (1.0.529 or 554). Seller doesn't accept messages so I can't ask anyway
https://www.ebay.com/itm/253547469659?V ... 3547469659 - Seller said 1.0.554
In case you're wondering, I don't just hang out on eBay looking for prototypes. I set up email notifications for "nspire rare", "nspire prototype", "nspire evt/dvt/pvt", "nspire development", and "nspire engineering" (that one has some false positives).