Given that the slaves rose up and murdered their slaveowners, who were also Haitian, there is no one left for them to collect from, even if you could find someone still alive from that period who worked as a slave. In other words, those slaves took payment, via genocide, a long time ago. That's one of the problems with murdering all your oppressors and seizing all their assets -- at that point you have no one left to blame when things go bad over the next few hundred years.