Well to be honest, if things have sitting around for too long they need some "reseating" of sorts. My ancient PRO4/AA had that, but I wouldn't call it burn-in or anything. But then again that's a dynamic driver, not a source.
Unless the soldering is shot (or somesuch, I'm no techie), it'll only be your ears that need to burn in...so long as internally the player is OK, play & enjoy!
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