[bchen5476]

I could only think that if you left any information on the MacBook, then they’d be able to get those details.
Proceed how you see best. I have no further advice.  

Don't they just ask challenge questions based on your actual security questions? And if I remember correctly the techs don't have access to the answers.

i dont think they do. i tried contacting apple and all i gave them was a apple ID email and they told me the same thing