I’m still not clear about what equipment is missing but I think it’s the retractable cover in the cargo area.
He bought a CPO, I would think that all the standard equipment would be conveyed when you spend so much extra for them to “certify” a vehicle.
On top of that it appears that the equipment might be there but is damaged (only part of it is there). AND the sales person may have given him inaccurate information.
This is a CPO, if it is determined that he didn’t get all the standard equipment, the dealer should step up or he needs to contact Lexus customer service (1-800-25-LEXUS) and see what they have to say about what their expectations of a CPO are.