Catalytic converter

I just bought a 2010 Buick Enclave with 60,000
miles on it drove it for 3 weeks the check engine
light came on and the car started to cut off took it
to the shop and they said it was reading misfire on
5 and 6 and reading code for 30 which means it
needed a front catalytic converter I just took the
front converter off and it is completely Hollow has
no baffles inside so I took the exhaust off all the
way to the resonator and there is nothing inside no
pieces from the converter is it possible that the
pieces melted