as jewellery is plural why is a used rather than aux?
à indicates what something is designed for even if they are plural - see examples below:
une boîte à outils = a toolbox
une boîte à bijoux = a jewellery box
une brosse à dents = a toothbrush
aux ( à l' - à la - au) is usually used in expressions with food (meaning with - flavoured with) as Jim suggested.
Although you can find 'une boîte à/aux lettres' (= a letterbox)- see link here: une-boite-aux-lettres-une-boite-a-lettres
I hope this is helpful.
Bonne journée !
As you are probably aware, à can take a number of meanings one of which is "avec".
So "boîte à les (aux) bijoux" represents "box with pieces of jewellery"
Hope this helps.
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