False info from agencys

Hi, I have a question, do you think the adoption agencys will ever give you false info about who your birth mom is when you e-mail them? have you ever heard of this? Can they also falsify documents? I e-mailed the agency where I was adopted and ask them a few questions, and to give me the first name of my birth mother and they did right away only the first name, but I don't think it is true, just and intuition I guess. I didn't pay them anything, the person just e-mailed me back and told me what I asked. Do you think they would lie so you can't find them. Thanks