[cybrjoe]

Maybe a different carrier with different coverage?

I'm also wondering if Find My will save the "find", including GPS coordinates at the time, and report it out when it has connection?

[mgarciaisaia]

Find My doesn't require the passerby to have connectivity _at the time it passes by_. They record where they were when they saw the lost phone, and whenever they get connectivity back, they report that to the owner.