OK, so after your comments reminding me about APH3, I checked back in with my delivery agent and challenged the information.
He reiterated that my vehicle is absolutely HW3. He explained that HW2.5 is denoted as PARKER_PASCAL_2_5 in the Tesla system for this entry. A little research confirms that the 2.5 board used nVidia Parker and Pascal chips, so I don't think he pulled this out of the air. Tesla AutoPilot v2.5 PCB is showing NVIDIA Pascal and Two Parker Chips
I'll still verify, but am feeling more confident that he knows what he is talking about.
He reiterated that my vehicle is absolutely HW3. He explained that HW2.5 is denoted as PARKER_PASCAL_2_5 in the Tesla system for this entry. A little research confirms that the 2.5 board used nVidia Parker and Pascal chips, so I don't think he pulled this out of the air. Tesla AutoPilot v2.5 PCB is showing NVIDIA Pascal and Two Parker Chips
I'll still verify, but am feeling more confident that he knows what he is talking about.