We as the prime contractor, filed the Notice of Commencement of the commercial project we were hired for. We have a sub of a sub (they provided temp labor) that feels they have lien rights. We have not received a notice of furnishing from them and from what I read, they would be required to file a Notice to Contractor (they are not directly contracted with us) 30 days of the NOC filing or 30 days of first providing, of which, this time has passed. Please advise.