500k is not necessarily the mark for retirement. With the RTSs running for 20-22 years, they definitely accumulated way more mileage than that. Plus, there were some OGs, namely 2004-05 ones in Brooklyn, that hit over 600k around four-five years before retirement.
As of yesterday, all Base Order XDE40s once assigned to Quill are now in service at Manhattanville. The last one to go into service at Manhattanville was 9599, after being fixed up for a couple months.
Mother Clara Hale has all but three of their XDE40s. Once they (and 9416) arrive, the XDE40 order will be complete.
Meanwhile, all but three of Quill's base units (9590-9619) are at Manhattanville. The ones that aren't there yet are 9599, 9607, 9610.