I must have looked at half a dozen suppressor manufacturer websites along with the BATFE site before sending in my paperwork. I swear I don't remember seeing that required form mentioned anywhere. My LGS had just gotten their class 3 license so they were new at this too.
Form 4 mentions the $200 check, fingerprints and photos. It has the CLEO area to sign. But no mention of a second form to send too.
I sent the paperwork back today via priority mail. It's been a long year waiting so far. Hopefully I am in the home stretch and can get my suppressor out of NFA jail soon. This is my first one so the wait has been really painful.
EDITED: I found this link today. It mentions that only one copy of form 5330.20 needs to sent with form 4. I hope my situation saves someone else from a delay.
http://www.atf.gov/press/releases/20...or-form-5.html