请教UPS 邮递问题，USCIS的PO BOX 有人签收邮件吗？真是头痛！

上周收到I-485 REF的通知，就立刻补交了材料，周六上午用UPS 的EMPRESS MAIL发出了补件。想着周一上午能寄到TX的PO BOX 852381.但今天周二一查我的邮件却是下面的信息。难道PO BOX 852381 上午11：32 没有人接收邮件吗？还是PO BOX 就没有人签邮件呀？早知如此不如走挂号信，白浪费的偶的银子，还想着邮件会不会被退回来：（
We attempted to deliver your item at 11:32 AM on July 24, 2007 in MESQUITE, TX 75185 and a notice was left. A second delivery attempt will be made. If unsuccessful, we will hold it for five business days and then it will be returned to the sender. Information, if available, is updated every evening. Please check again later.

所有跟帖： 

• PO Box is only accessible by USPS - 回复：请教UPS 邮递问题，USCIS的PO BOX 有 -pjiang- ♀ (222 bytes) () 07/24/2007 postreply 14:19:48

• 回复：NO worries; they will try again tomorrow. -pee-dos- ♂ (0 bytes) () 07/24/2007 postreply 14:20:22

• 回复：谢谢楼上老师的详细回答，还有PEE-DOS的安慰。好人一生平安！：） -lovecheese- ♀ (0 bytes) () 07/24/2007 postreply 14:26:22

• no ? for 好人一生安！ ^_^ -lovecheese- ♀ (0 bytes) () 07/24/2007 postreply 14:29:25

• 回复：请教UPS 邮递问题，USCIS的PO BOX 有人签收邮件吗？真是头痛！ -cxw1001- ♀ (233 bytes) () 07/24/2007 postreply 15:44:46