By the way this fake 6619d is a common thing I guess!
I had bought a suppose broken 66319d from eBay for 120 bucks, I than realised, even before getting the item, that was FAKE as hell. The serial number was matching a serial number of another unit that is in another listing on eBay!
When it arrived it missed the additional board but did no have any modification as first glance.
I was able to ship back the unit and get a broken 66319b instead that is "real". Sold as broken turn out the main flat cable connecting the CPU to the power board was not plugged correctly!!
So the real question is what the hell people were doing with this unit? In my case apparently it was coming from a trust source!
So in general I would ask for an internal picture before buying any of this PSU as it is easy to "cheat" the model!
Also in my new unit, the back panel serial number did not match what the instrument is reporting. Now the big question is what is right between the two? Maybe the CPU board got swapped I guess.
Next thing I will do is move the DVM board from my 66309d into this unit to convert it to a 66319d.