帮人申请Reentry permit

USCIS 寄来receipt notice,说received date是6/8/2010，,算来快4周了，我今天上USCIS，check my case status,输入receipt number，居然说“Your case can not be found at this time in My Case Status. Please check your receipt number and try again. "
receipt number我反复确认过了，没错的。
这怎么可能，好歹应该是第一个Acceptance的状态啊？

还是USCIS的这个查询状态的系统就这么不靠谱？

谢谢。