Where did Donnie get the money from at the end of Den of Thieves? He was handcuffed but got free. Did he find the second garbage truck? Did he divert the other thieves?
Yes. he did use the second garbage truck
Nick later goes to Donnie's bar and sees pictures of him with some of the crew members from the heist, also noticing that employees of the Reserve are regulars since it's nearby. It's revealed that Donnie actually masterminded the heist to keep all of the stolen cash for himself in a second garbage truck. After the passage of some time, Donnie is working in a London bar where several Reserve employees and heist crew members (including the garbage truck driver, one of the Reserve employees who ordered from the Chinese restaurant, and the communications expert from Merriman's crew) are seemingly enjoying their retirement and where Donnie is planning a new heist of a nearby diamond exchange.