these are my educated guesses. RNG determines civilian and item box spawns.

Civilians on Any Given Map: 15 (20 with Frieza)
Civilians in Areas A-E: 2-4 (3-5 with Frieza)
Civilians in Area X: ≥1

Item Boxes in Any Given Map: ≤90
Item Boxes in Areas A-E: 15-17
Item Boxes in Area X: ~3

whether or not i update is an eternal "maybe.

then again, i dunno who reads these guides anymore when you see that player count from Season 4.

yeo was here