--Matt--
You had the feeling that soaking yourself was not the best idea to get the short interval of peace, because, annoyingly enough, you didn't find any significant wireless traffic on the outside of the warehouse. You suspected that you found the main node inside, but that wasn't too hard, it wasn't hidden at all. But the signals you sensed suggested that whoever installed the keypad was smart enough to wire it to the main node.
As for other sources, they were probably set to a low signal rating, and the heavy rain just made things worse. You weren't sure that you'd have felt even some of the cheaper commlink models being active inside the building.
Your little detour yielded some information, however. The truck was definitely gone, as you all assumed. And even through the rain, you thought you noticed two security cameras under the roof hanging over the landing ramp, one of them directed towards the personnel entrance, the other looking over the loading gates.