Currently, it's just the 2007 MCI D4500CLs and 2008 MCI D4500CTs which are being removed from Staten Island. As of now, there are no known plans to remove the 2013 D4500CTs from service at Charleston or Queens Village.
6713, which retired a while ago, is somehow tracking on the M3 on Transsee. Unless it's a glitch and actually another unit.
Edit: If you check on Bustime, it actually appears as 6813. On Transsee, it appears as both.
While looking at the #6691-6725 range on Transsee, it appears that 6716 (from Manhattanville) hasn't ran since May 25th, and 6718 hasn't ran since June 11th. Every other OG at the Ville appears to be running strong for now.
At this current moment, it looks like the '08s D4500CTs from NYCT won't be seeing service at MTA Bus. I drew this conclusion due to 2218, 2219 and 2227 being sent to Eastchester Scrap after formerly being assigned to Spring Creek and Far Rockaway (pending).