Thanks to Nico Janssen, PA0DLO for the following updates to the AMSAT-NA TLE Distribution:

Cubesat Atlantis, object 42737, has recently reentered and has been removed from the TLE Distribution.

SNUSAT 1, object 42733, is not active. But its brother (or sister?), SNUSAT 1B,object 42727, is active on downlink 435.950 MHz.

SNUSAT 1, object 42733 has been removed. SNUSAT 1B, object 42727 has been added.

Note that these last two cubesats are not correct in the Space-Track catalog. Their NORAD CAT ID's have been reversed. Nico has informed Space-Track of this issue.

If you remember, SNUSAT 1 and SINUSAT 1B were part of 10 QB50 satellites were launched from the ISS on May 27, 2017. A total of 27 satellites deployed from the ISS from May 5 through May 27, 2017. Which could explain the confusion.