I recently had a big loss in my life but through my loss I recieved two beautiful Browning belguim auto shotguns. One a light twelve and the other a sweet sixteen. Both guns are in good shape, neither being close to perfect. No major cracks, minor dings here and there and the blueing is good. I just call the damage character marks my grandpa left for me. My question is can anyone help me identify the serial numbers?

the light twelve is 5G 76134

the sweet sixteen is S 42878

thanks in advance and may my grandpa rest in peace