For those that received their extension letters, was the return address on the envelope the service center that has your application? Or was it different? Our application is supposedly assigned to Potomac (YSC, which would be an address in Arlington, VA), but I see something from USCIS in Informed Delivery to be delivered tomorrow (I would think it’s the 48 month extension), but with a return address in Lees Summit, MO. Past extension letters came with Potomac Service Center as the return address. No new updates since “fingerprints applied” in 2021 on the case itself.