all the codes are alpie52 atom igloo8 school wheel and Hmm...a Ruler whitewash snowshoe cooler and the other one are all gone.

I'm not sure about code 4....

it looks like code 5 is probably to write the letter directly below that letter/number on the keyboard:

5 -> t(because "t" is right below, and slightly to the right of, "5" on the keyboard), y -> h, 8 ->i, etc...

The code translates into "this coupon is sneeze"

I emailed you the answer.

Code 5 is sneeze