Vehicle (and player?) spawned in on top of crate

So at the start of the game I went off to a place on my own with no other chutes anywhere nearby. Looted a couple of building then a plane dropped a crate within 100m of my house. Ran out there immediately and as I approached a car spawned in right next to the crate (as they do when you first chute in, so initially about 2m off the ground).

I was somewhat surprised when a couple of seconds later a player got into that car having obviously looted the crate and drove off.

What gives? How did that player get there? There was no one nearby, I didn't hear any vehicles. Why did that vehicle appear to spawn in when already well into the match?

If anyone can explain that would be appreciated.