If the sheriff's office is having difficulty finding him when they look to serve the paperwork, you can have the papers served by a private process server. The papers can be served by anyone who is over 18, not related to you, who is willing to hand your husband the papers and later signs an affidavit of service in front of a notary public.
Stephen Harkess is an attorney licensed in the state and federal courts of Colorado. This answer is for general information only and does not create an attorney client relationship between Stephen Harkess or Harkess & Salter LLC and any person. You should schedule a consultation with an attorney to discuss the specifics of your legal issues. You can reach Harkess & Salter LLC at (303) 531-5380.