2008 Chevrolet Silverado 1500 - Radio locked - any ideas?

Just picked up an 08 chevy silverado 1500 at an auction with only the key no remote i dont know if by not having the remote if it would put my radio in to locked mode but i would like to find a way with out having to go to the dealership to unlock my radio if anyone can help

Try this: https://chevroletforum.com/how-tos/a/chevrolet-silverado-2007-2013-how-to-unlock-radio-390943