Where is the money?

Just watched this again this evening.

**********SPOILERS BELOW*************

In the final act of the film:

The Player got two lockers/keys at the train station. She put the $200k from the robbery in one locker, leaves one empty. She now has 2 keys. She gives the key for the empty locker to Exchange Man at the sandwich counter. Exchange Man puts the clean money (exchanged 25 cents on the dollar for the 200k ) in the empty locker and takes the key with him. He then trades this key to The Player at the sandwich counter, she gives him the key for the locker with the $200k from the bank job. Exchange Man takes the 200k from the locker and gets on the train. Gold Plainclothesman sees this from the phone booth at the station and informs The Detective as to what happens. The Detective finds the case with the bank money on the train and kills the Exchange man after figuring out who he was.

Then when The Player returns to take the case of clean money from the remaining locker, her purse is stolen by The Kid at the train station. The Driver and The Player chase down The Kid to the warehouse. The Driver kills The Kid, gets the purse back with the key in it for the locker with the case of clean money. The Driver returns to the station, opens the locker and removes the case with the clean money in it. As The Driver looks in the case, The Detective shows up and takes the case from The Driver. When The Detective looks in the case he finds it empty as The Driver already knows this he says, "looks like we both got swindled". The Detective says, "looks like we both got ripped of by the Exchange Man."

The Detective recovered the money from the robbery but nobody gets the exchange/clean money, which should have been 50k, because it was never there. The Driver walks free, there is no evidence against him. The Detective held up his end of the deal he made with The Driver. He let The Driver go. And the Exchange Man ripped them off.