What do some of these codes mean. Have had to sheet some packages as these and never really understood these terms that UPS uses and that plus thing that gets marked on certain packages with the codes in the upper left and I dont even know what gets marked in the other three areas. I know its a bunch of numbers and stuff. COULDN'T ADL PLD DN ALLOW NOT IN 1 NIB NIO What are some other attempt codes that are used besides these? Thx.