upon looking up information I found a few interesting quotes

Stealing or tampeing with another’s person’s mail is a serious crime.  and serious punishments .  In the United States it is illegal to take another person’s mail from a postal truck, a collection box, an apartment mailbox, a mailing rack, or a neighborhood delivery or collection box.  The united states Postal service is a federal entity and therefore stealing or tampering with another person’s mail is a federal crime. 

The law concerning mail theft is under Title 18 of the US Code ( crimes and criminal Procedure ) section 1702. Obstruction or correspondence and states:
Whoever takes any letter, postal card, or package out of any post office or any authorized depository of mail mater or from any letter or mail carrier or which has been in any post office or authorized depository or in the custody of any letter or mail carrier before it has been delivered to a person to whom it was directed with design to obstruct the correspondence or to pry into the business or secrets of another or opens, secures, embezzles or destroys the same shall be fined under this title or imprisoned

on answers .com
an answer concerning the  the penalty for mail theft from a judge: 
What type of crime is mail theft.  It is a federal crime 700+ words
On a single count of mail fraud federal sentencing crime carries a maximum penalty of 20 years. 

Email I sent ( postalinspectors.uspis.gov) subheading: contact us
subheading file a complaint:   Monday November 15th 2010 @1:48pm
To Whom it may concern: 
I called your toll free line#877-876-2455 and spoke with a woman named Mary from Miami ( no id) who told me to call Tampa because my address had a zip code of 34110.  The telephone number she gave me was (813-281-5256) ( not listed on your website ( postalinspectoruspis.gov) .

I originally filed a complaint /police report with the post office and the police concerning mail  theft and mail tampering. 

In  2006 i requested an additional birth certificate for reissue of my USA passport.  Upon receipt of the birth certificate the letter had been opened and tampered with
( you could tell that the letter had been re-closed and resealed. )   Upon opening the birth certificate one of the receipts that should have been attached to the certificate was missing. 

In 2007 I ordered my West law account and west law id and password information and card  were sent with my account information.

* In December 22nd of 2006 one password and pass code id were sent to my address.

* On March 19th a second id was ordered and sent March 19th 2007.  I never received  that card /including the pass code and password id in the mail.  I called West law and it was sent but i never got it in my mail.   I believe it was stolen.

*On April 5th 2007 the 3rd of the 3 cards were sent to my address. 

In addition, I ordered a copy of Blacks family law terms handbook full set  
( item #17464515)and had to reorder an additional copy when the first didn’t show up in may mail.

I met a con artist by the name of Gerard Ahler ( 2003)and additional Bully in 2005 Karen Kahel and believe that their associates may be responsible for numerous crimes that occurred in my life between the years of 2003-2010.

I want to press felony charges for  all the postal crimes committed.  The crimes of tampering with my mail/mail theft and probably will be dealing with identity theft and other numerous related crimes as well. 

If you have the additional reports or additional information on the crimes i mentioned please email copies to me so i may keep in my files and update the police on the progress in  catching these criminals.

Thank you for your kind attention in this matter ,
Sincerely,
Mary jean ziska ( whatabtmary@yahoo.com)