MFGR could not and would not install weep holes as this would require another completely seperate listing by U.L.
Errrrr....something like "One sided Rainproof boxes arranged for drainage". lmao
You have noticed that they don't pretend that 3R pull/junction boxes are watertight havn't you? They all have a definate up/down orientation and cover....and weep holes!!!!!!!
Only the poor lowly 1 and 2 gang bell/reddot/T&B boxes are supposed to somehow be impervious to water and its affects. Another carryover from 50 year old codes that take no notice whatsoever of reality proven in the meantime.
All these boxes fill with water, the aluminum corrodes, the steel rusts, devices trip, and yokes corrode/rust off. Everyone in the trade knows it yet nothing is done....oh no we are too busy mandateing tamper-proof receptacles or some such equally important rubbish...Grrrrr.
Ok...let me take a deep breath or two....ahhh...all better now...
Weep holes drilled by the installer are an important and necessary means of making the installation long lasting and a trademanlike installation.
Thats about all I can say....do it right or do it wrong...it doesn't really take any more to do it right if you know what your doing....but you can do it wrong and then suffer through the callbacks....your choice I guess....