My late 2013 Macbook Pro was stolen a week ago and I've been tracking it with 'Find My Mac'. The thief would turn the laptop on for a few minutes at a time in the evenings and probably try a few passwords.
A few days ago, I went into FMM and it said that my Macbook was locked. I can only assume that it was due to failed login attempts because I didn't remotely lock it or erase it. Since being locked, it hasn't been online in FMM. Can it still connect to wifi/icloud when locked? All options except "Play Sound" are greyed-out in FMM.