回複：請教UPS 郵遞問題，USCIS的PO BOX 有人簽收郵件嗎？真是頭痛！

You will be OK. I used the UPS overnight service to submit my AP and EAD applications earlier this month. The package was picked up around 4pm PST time and was delivered around 10:00am next day when I received the confirmation email.