No, normally lockers would be labeled. In this case, the federation made a backwards twist just so that overly enthusiastic fans would have trouble locating the lockers of their favorite wrestlers to steal souvenirs from them. The part where having to count lockers backwards is the one that most get stuck on. I could add a hint on the key tag so that there's a better way to know. Currently, you just have to work out that since you count segments backward, that's the way to go for the lockers too, but it's not obvious. A backwards arrow along with the locker number could help, right? I'd also add an early hint before the puzzle starts saying something about "the locker solution being rather backwards".
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Feasible even, that somebody kept forgetting which locker was theirs and doodled either the code for their locker or some other hint on it. Actually, some scribbles could even be hints about the character a locker belongs to instead of hints for the puzzle, make people want to take a look at them regardless. Just a fun idea!