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I wouldn't worry about it too much. I've seen a ton of UB with only 3 nipples instead of 4. This includes new models too (CNY, Kith and RC being some). I would say 1 out of 10-12 pairs of UB only have 3 nipples. Plus, boost is boost. Just touching, or feeling it can tell u if the pair is legit or not.
Not that im worried. Its just my first time to have a pair wherein the left has 4 nipples while the right has 3.
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