The Fence is active late at night (game time) at a random coastal or rural spot.

A feed message tells you where he showed up. Head there while he is still around.

Press E to open the Fence menu and sell stolen goods for cash. He only wants fenceable loot from heists and similar crime.

Kortz sends you to its own fence after the job. Burglaries use a buyer for the van haul instead of this nighttime Fence.

Watch his budget. He leaves when he runs out of cash or morning hits. Cops nearby make fencing too risky until they clear out.