Well this thing has lots of peripheral people involved up to and including Stretch Pelosi and her bunch...so it wouldnt surprise me if it was fake...but Wild Bill cant assume that yet
Second, go to Whitepages.com to see if you can come up with the same phone number as in the letterhead.
If address Zip Codes and phone numbers don't match up, the odds are very good it's fake. Most pranksters fail to be all that careful with these items.
Then, call the number in the letterhead and see how they answer the phone, particularly if its after hours!!!
Lawyers go home or get drunk or visit the jailhouse scouring up business late in the day, so it shouldn't be possible to reach him late. Plus, it's motions day about everywhere, so there shouldn't even be a lawyer in the office.
If a kid answers the phone, you know there's some real problems with the letter.