Prewired for factory sub I think

[Afrancis]

So I replaced my single disc cd player finally with a audiophile 6 disc mp3 one. This is the first time Ive ever had my cd player out the dash so I didnt know what was back there. When I pulled it out I found all three of the plugs, now I knew it was prewired for dvd player cause I found the wires over the rack a long time ago. Ive searched everywhere underneath the driver side rear seat where the wires are suppose to come out at. Is there someway they stopped the wires somewhere else when they wired it up? I mean the wire is at the HU but not where the amp goes? Any help would be greatly appricated.