Item That Gives Items and Adoptables

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I need help on creating an item function that would allow me to create an item that can be opened by a user, and once opened, give the user items & adoptables I have inputted it give, at the time or date I have specified, only once for each user.

I want to make this function so I can give newbies starter packs on register, and players who have played for a certain amount of days giftboxes.