Mailbox Auditing in Exchange 2010 does not work

Hi guys, I'm having this problem for Weeks!!!, can't get the answer for this particulary case, I have a lab with Exchange Server 2010 SP2, I was testing the Mailbox Audit Feature, but, no matter how many times I try, is not gathering results, I had executed this following commands in the PS

1. Set-Mailbox user1 -AuditEnabled $True

2. Give FullAccess to the Administrator account, to manage the user1 mailbox audit logs.

3. Execute the Search-MailboxAuditLog, but no results.

4. Verify the ECP, but nothing!!

I have checked so many forums, blogs, a documentation about this, but can't find an effective solution.