As the BBC puts it: "They do not eat pork, they practise male circumcision, they ritually slaughter their animals, some of their men wear skull caps and they put the Star of David on their gravestones." They also have a tribal artefact called the "ngoma lungundu," which seems to be a replica of the Ark of the Covenant.
No replica of a melted Nazi by the Ark, though. Guess Hollywood's influence is limited.
Many Lemba are now Christians or Muslims, but DNA testing has confirmed that the Jewish practices and symbols, and Lemba oral history, are no coincidence. Members of the Lemba's priestly clan (the Buba) even have a genetic element also found among the Jewish priestly clan, the Kohanim.