Could someone make this:

[Duck]

1: If it won't find the inventory, the script might break right there.

2: Is the block's size 16, 16 EXACTLY? Because if it isn't 16 by 16 units it won't shrink. I'll test it out again, but if you're left clicking and holding a 16 by 16 box for 2.5 seconds, it should shrink and go into inventory.

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Worked fine for me.

I found out why it won't work on the other one. Apparently, for some odd reason, there is no Storage in my World. So I have to copy and paste one. Thanks! - Also, the box has the grass bits which are grouped into one model each as one block. So, would it be possible to make them go away completely?

Use a texture instead of individual blocks