It appears that Frank Marr agreed to pay the $5 million for the heroin which was to be conveyed in the suitcase Lorna bought. But a million dollars can't even fit into a foot locker (despite the fact criminals are often shown on TV being able to fit such amounts into a briefcase). The only way the 5 million would have fit would have been to use the out-of-circulation $100,000 bills, which would have been useless to everyone.