To make the appointment you need your identification number that is on your birth certificate or birth certificate and in the last case your birth certificate, if you do not have any of those documents, you would have to talk to your relatives in Honduras and they get you that number where you were born.
Go or call the consulate of Mexico and explain your situation, and IF the clerk who attends can not solve your situation, ask (demand) to speak with the consul or a person of authority to solve your problem, even if temporarily , until you can get them to send you their certificate, baptismal certificate, school records, police report of what happened to him, etc., etc. The consulate of your country is precisely to find a way to solve this type of problems. Do not accept "you can not" In response. SAY THIS IS AN EMERGENCY. Demand to speak with the consul or with a person of AUTHORITY. LUCK
Even if you have or know your number will still need your birth certificate or cedula, without that you can not get a passport or other document.
Thanks! Your answer is awaiting moderation.