A day at work...

Dear Dr. ___,

I received your forms and the forms of your coauthors, but they did not fill out the forms correctly [ did not check "yes" or "no" under the conflict of interest section]. I will need you to resend their forms. Thank you.

Sincerely,

A.C.
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(From Dr. ____)

CAN YOU NOT JUST CHECK no?
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Dear Dr. ____:

Unfortunaltely, no. I cannot fill out the forms; they must be filled
out by the authors.

Thank you,

A.C.
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(From Dr. ____)

Ok, you can send them emails. They can do the marking and fax it back
today.
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Dear Dr. ____,

As corresponding author, you are to take responsibility for the forms of all of your coauthors. It is not my job to obtain these forms. You can either obtain the forms, filled out correctly, or I can pull your manuscript from publication. You choose.

Sincerely,

A.C.
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(I didn't really send that last one)

***UPDATE***
I got this great idea to forward the snotty emails to the other authors when requesting their signatures. Dr. ___ may have gotten his way in that I ended up doing his work for him, but his coauthors got to see how much of a tool he can be. Yahoooooo! I win!