Well, it's a little hard to make the math on this other claim work out: Steven Rambam, a blunt-talking, New York P.I. who’s helped locate tens of thousands of missing and dubiously dead people over the course of his 40-year career

20,000/(40 * 365) = 1.3 found per day for 40 years. Maybe there are large groups faking their deaths at the same time?