We thought it was 1337 at one point, because I'm prone to making stupid mistakes like that, as Fish knows.
But even AFTER it went past 1337, it came up as 'leet'. Every now and then when I check his profile for it, it sometimes pops up, and then vanish in a matter of minutes. Have not seen it occur again in the last few days, though. (maybebecauseihaventbeenchecking).