I don't know what FM3 is, my wife is from Mexico and Mexican Citizen, we have someone there to do it, however if we know what to do?? Funny anh?
I have no idea how to get this report, there are no clear instruction, therefore I asked folks in Mexico to investigate for us. Also waiting on the CIC instructions ~ In the past few days that's what I found out;
1. Province Police report is very easy and given if someone is there for you to pick-up, they issue it the same day.
2. Federal is issued only from Mexico City and I have no idea what they need, and also someone can do it for you but before starting the process, you need to know what is needed.
Bottom line is if you don't have anyone in Mexico, then there is no chance you can get the federal report unless you travel, even if you have someone there, there are no guarantees that they will give it you and will not throw obstacles because of corruption.