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Once you’ve managed to nab a present, it won’t automatically open for you — you’ll have to throw it if you want to collect all of the goodies that are inside.
To throw a birthday present, make sure you’re holding it in your hand. You’ll then want to hold the left trigger button and then press the button to shoot, which will then throw it on the ground.
Though they initially appear small in size, they’ll become really big and will take up a good amount of surface area.
Source: https://www.distractify.com/p/where-to-find-birthday-presents-in-fortnite
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