Here are the results: (rendered letter-for-letter, all mistakes left intact so we can laugh at them)
Page 5, panel 1: "IBB! LOOKING FOR THIS BOYS? YOU KNO THERE'S NOTHING LIKE THE BRLLIANCE OF A FINE GEM!" ("ibb" comes from "ahh", which evidently was not part of the cryptogram)
Page 5, panel 2: "IT BRINGS OUT THE LUSTER IN MY EYES NO?"
Page 5, panel 5: "IT'S TIME I BID YOU ALL ADO! ALRIGHT BOYS MAKE WITH THE YANKY YANKY!"
Page 6, panel 3: "SORRY BOYS, IT'S TIME. I TOOK TIS GEM AND BID YOU ALL A FOND BDDO!" (this one was encoded in a different cryptographic key for some reason)