Seriously, no one should complain about not keeping FUSC while getting 5K refund. The 5K was always an exchange for FUSC not a refund for the PUP and why it made sense for the non-PUP to get it too.
The argument went like this. Since it was brought up that it is unfair that new owners can now buy the P3D for 5K less, Elon rebutted with the fact that new owners don't get FUSC which in his mind was a wash with the 5K discount. When people disagreed with that value he said fine, I'll trade you 5K for FUSC so you can get the same deal as new buyers in a sense making it a wash even for those that disagreed with the value of FUSC being 5K.
But if you got to keep the FUSC and received 5K it would no longer be a wash. So you can keep one or the other but not both. Makes sense and no one should complain. Decide which is more valuable to you and keep that.