In 2004, Cooper graduated to the Dolphins' Queensland Cup side, playing for them 13 times and represented the Queensland under-19 team.
ɪn tˈuː θˈaʊzənd fˈoːɹ, kˈuːpɚ ɡɹˈædjuːˌeɪɾᵻd tə ðə dˈɑːlfɪnz kwˈiːnslənd kˈʌp sˈaɪd, plˈeɪɪŋ fɔːɹ ðˌɛm θˈɜːtiːn tˈaɪmz ænd ɹˌɛpɹᵻzˈɛntᵻd ðə kwˈiːnslənd ˌʌndɚ nˈaɪntiːn tˈiːm.