请问“Delivery attempted ”是什么意思？

chwbin

我的一个单子，出现了以下的状态，是不是投递失败，难道qqex的美国地址不可用了吗？会不会被退回去，如果退货了，该怎么办了？
Latest Event:                                                        Newark DE
Delivery attempted - December 28, 2013 8:41:00 AM

快递公司网站上查了，问题显示如下：
We attempted to deliver your item at 8:41 am on December 28, 2013 in NEWARK, DE 19711 and a notice was left because the business was closed. You may arrange redelivery by visiting http://www.usps.com/redelivery or calling 800-ASK-USPS, or may pick up the item at the Post Office indicated on the notice. If this item is unclaimed after 15 days then it will be returned to the sender. Information, if available, is updated periodically throughout the day. Please check again later.