OPT Extension YSC1890118XXX Timeline 58天制卡

02/25/2018 USPS Priority Express Over Night寄出
02/26/2018 Delivered
02/27/2018 Case Received
03/05/2018 收到邮件和短信提醒的Case Number
04/27/2018 New Card Is Being Produced

总共经历58天。是今天从USCIS EGOV上查到的，myaccount.dhs上没动静
根据经验，果然23月份是OPT淡季，速度要比平时快很多。