I think it's rng if each blows up? I only did it once, but my first and third crate blew up. First left them at half health, third left them at 1 health and I one shotted them all.
2 of the boxes are one kind that blow up the 3rd box is a completely different kind of box that doesnt blow up. Click on them and read, it even as a seperate name.
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Sorry for my English :]