Was an original CSR holder and for years it was a no go, no matter what for a retention credit. Every now and then a DP pops up, but I am usually skeptical. Not calling them liars, but they are clearly outliers and who knows what their relationship with JPM is. At this point it seems pretty concrete that no one should expect a CSR retention credit. They are like unicorns. Be glad you are only paying $450 and not $550.
Actually, I wonder if getting charge $450 (and not $550) is the reason I have no offers.