How can you tell if in-ear headphones have been tampered with?

Nano0806

Estimable
Sep 17, 2015
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I have a pair of in-ear headphones, Sennheiser MX375 to be more specific and suddenly the left earbud stopped working and i opened it to see what is wrong, the wire that connects the coil is broken.
But then i realized they still have a warranty.
If i return them will they be able to tell i opened that earbud? Are there any seals or things like that? I didn't use any tool, i just popped it open