When we visited Manaus, maybe 7 or 8 years ago, the Chronicles warned of a high rate of pickpocketing and not to wear jewellery or ostentatious symbols of wealth, hide purses and wallets, and be discreet with valuables such as cameras etc.
As we left the ship the couple in front included a man with a camera round his neck and a fanny pack (I'm guessing it held his wallet), both were wearing Rolex watches and the female was wearing a chunky gold (or at least gold-coloured) necklace.
I bethought myself that if the pickpockets were active then this couple were an excellent decoy. Made us feel safer.