You are right. You need to take the mailing time and potential delivery risk into the consideration and leave enough time space for mailing. Your attorney should tell you the tracking number of your mail after he/she sends out your package.
Regarding your last question, please read the following comment:
(Information source: http://www.*****/ym_article/hooyou/23588532.html)
有关这些重要日期,移民局是以申请人提交申请的日期为准还是他们收到申请的日
期为准?
根据移民局最近给美国移民律师协会的一份备忘录,这些日期是以你提交申请的时间为
准,包括邮戳、或者是FedEx, UPS or DHL的收据。但是,我们还是建议你确保将你的
申请在最后期限之前送到移民局,以防移民局的收件工作人员出错
回复:回复:Further suggestion ...
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Thank you very much for the information.
-ccyao-
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07/22/2007 postreply
11:04:06