Find my iphone was turn on but activation lock is off
I accidently removed my iphone the day I lost it because I saw the words (lost, stolen, or sold), and panicked (first time losing a phone) so I removed my device. However the next day it appeared back on my Find my Iphone app as offline so that must mean it connected to the interent and that find my iphone was still turned on (I had a passcode). Why is activation lock still off? Is it possible they factory reseted my iphone through recovery mode or DFU without using apple id which is linked with the iphone. If it's possible, will my device be shown as removed from FMI or will it stay the same which is offline?
iPhone 6s, iOS 9.3.2, null