I got a multimeter into my hands and figured it out. For posterity, the pins are:
oo ¯\_(ツ)_/¯
__ empty, no pin
oo 0V
oo D+
oo D-
oo 5V
(‘o’ denotes a pin, ‘_’ denotes empty spot). Pins in both columns are ordered in the same way. OneRNG needs to be connected with the black pin at the edge and the second ground pin over the empty spot.