Last week two Green Cars marked SaRo E234-1001 and SaRo E235-1001 in Yokosuka stripes were seen being moved from J-TREC's Yokohama factory, this probably means they will be delivered to presumably J-TREC's Niitsu factory (where the majority of JR East's rolling stock are built) and the first E235-1000 set for the Yokosuka Line will undergo testing and delivery soon
https://www.youtube.com/watch?v=iH2BQGMwhhE