1. Add your items

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Flick the lever on the roof and choose your box. Then, place that box on the ground and put in your items. Once finished, put box back in dropper

2. Collect your items

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Press the button under the item frame corresponding the the dropper you used the box from. Once the lamp is active, press the button next to it and the shulker box should appear.

3. Finish with your items

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Press the button on the right wall to remove the shulker box and store it away.