Pretty sure you are not the first guy to press on it and wonder why the horn didn't work.
I had a buddy back in the day, a bit older than me who had worked at our local Dodge and Plymouth dealership. He was telling me how often they would remove rim blow wheels and toss them because the customers didn't like them or they didn't work. I've had a few of them and in fact still have one now hanging on my wall; that damn horn stripe can be a pain to get to work sometimes.
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)