Please Help 8 lao shi, the laywers lost my original approved PER

Dear 8 lao shi,

The lawyers informed me today that they lost my PERM.  I am supposed to file I-140 now and I requested the premium processing for I-140.  Now they say, they have to file I-140 without the PERM, because they lost it.  They say, they file it now, and at the same time, request the USCIS mail room to recover my PERM, as they accidentally mailed it with another client's information.  When it is recovered (if they ever can, may take however months), the lawyers will file another I-140 for me and can do premium processing then, and at the same time, withdraw the I-140 they are about to file now.  Another scenario is that my PERM cannot be recovered, and when it is time for me to file I-485, USCIS will request my PERM from DOL directly. 

1. What is your insights given this situation?  Is what the lawyers say correct?
2. What should I do to minimize the risks of denial? 
3. Will I be denied for I-140?
4. Will this affect my I-485 in the future?
5. Will filing a second I-140 affect anything? 

I appreciate your help!!!