Motorbike Helmet Australian Standard Sticker?

Yo, I recently went to my cousins house (and rode my bike).

One of my cousins is 5 years old and he ripped all my reflective stickers off my helmet while I wasn't looking - as well as my australian standard sticker. I tried to put it back on (obviously) but it wouldn't stick very well and has since come off while riding. It left some kind of special marking where the sticker was, so it shouldn't be too hard to prove that it used to be there (and I also still have my receipt for the helmet, which is brand new - bought about 2 months ago).

Is there any way to get a replacement sticker?

Do the places that sell the helmets put the stickers on themselves or does the company that makes the helmet do it?

Thanks