I looked at them and could not see any longer leg, or any sort of distinguishing characteristic
I know I struggled to find it on the data sheet, it is in the lower corner of the last page.
You don't need any resistors with the type of sensor you have.
If you wired them wrong then you probably have blown them because there is an IC inside as well as the sensor. it's probably an amplifier because these sensors have a very small output.
Unipolar - will only respond to one magnetic polarity
Bipolar - will respond to both magnetic polarities
Latched - will switch and hold that output state even when the magnet is removed until triggered again (possibly with the reverse magnetic polarity)