Depending upon the value of the bike, I would either pursue a small claims court case or hire an attorney. Either way get this in front of a court instead of a cop who most likely really doesn't understand the law (at best) or has some other reasons for depriving you of your property. I really doubt after all this time that the 'officer' is helping you get YOUR bike back. I don't care what the state's laws are concerning pawn shops, there is ample legal precedence that stolen property is never legally owned by another party even if they have purchased it legitimately.

If those fail, I would personally consider some traditional Arizona justice were I you.