Quid Pro Quo Hints

Click to reveal each hint
Suggested investigation steps:
    How many clues are there to find?
    Are all clues needed in the story?
    Are some clues used multiple times?
    Who's fingerprint is on the metal plate?
    What is the metal plate?
    What's necklace's role?
    What's the meaning of 262800?
    How many people were involved in preparing the robbery?
    How many people physically broke into the bank?