The trade also altered how the receiver approaches his future.
"I feel like it kind of changed me, like, as a person a little bit," Cooper told Kimberley Martin of Yahoo Sports.
"I looked at it totally different than most people looked at it," Cooper told Martin. "[The Raiders] basically said, 'We could get a guy, who's going to contribute better than he will, in the first round.' And I didn't know how to feel about that.
"I just always felt like I wasn't really being used how I felt like I would have used me if I was the coach. So I looked at it from that perspective, not from the perspective that, 'Oh, they don't think I'm good enough' or I'm not good enough.
"I never had those questions in my mind. At all."
"Just reflecting on my last four games here and my personality here, I feel like it did change me, as far as having that chip on my shoulder," Cooper told Martin. "Not that I wasn't passionate before, but playing with more passion, trying to intentionally have fun out there. It definitely has changed me, in terms of me going out there and just having fun with it.
"Because when you get traded, you start to think, 'Wow, that can happen,'" he added, snapping his fingers for emphasis, "Just like that."
Cooper's comment on passion is notable, as rumors swirled during the end of his time in Oakland that he didn't enjoy playing.
The trade rejuvenated the talented receiver and lifted a struggling Cowboys offense into one that can contend for the division crown.