A general rule is if the item is purchased from the Tibia Store with Tibia coins it is considered character-bound. However, there are some exclusions and I'll give you some examples: like Outfits and mounts purchased with Tournament coins get applied to all characters on your account. Also, during the Coronavirus, the Benevolent mounts purchased from April 17- April 31st were applied to all characters on the account. Hopefully, maybe in the future, Cipsoft will do more account-based campaigns. To avoid confusion, if you click on a Store item in the description it will say, "only usable by purchasing character" or "can only be unwrapped in a house owned by the purchasing character" meaning character-bound. The Tournament mounts and outfits all say, "usable by all characters of the account" meaning account-bound.
Sources:
Basically you have all items from the store
Keep in mind that every item bought from the store that goes into your Store in Box is character bounded.
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