They know about it for few days ("We will of course take action right away and check this account, it will be closed if the images are stolen.")

https://www.colourbox.com/supplier/rahman-kader-232062?page=1

I encourage everyone to check the site. There are a big number of thieves and stolen images. I found couple of mine there and send the site message to investigate.

YeH, like a contributer from Bangladsh is going to have those models and some of those backgrounds

Assuming that the thief has plenty of sales, why go to all that trouble otherwise, is there not a business opportunity to be had here.  Using services like Pixsy to litigate against the agencies that continue to allow known thieves to sell on there site.  Obviously, the thief will get away because of the difficulty in pursuing these matters in certain countries, but the account will be shut down and the agencies will be forced to take more care with the images they accept.  It maybe that the action needs to be taken against the customers, but will that then make them buy from more reputable agencies?  Again location maybe a problem here. Anybody out there take this route already for good or ill, I would be interested in the outcome.

They removed only the two example images I sent. One of which is by Yuri Arcurs and was part of group of images from the same shoot:

http://peopleimages.com/image/ID-306972-spf-50
https://www.colourbox.com/supplier/rahman-kader-232062?page=8

If CB is a serious company they should remove immediately such accounts. Everything is so clear, images with very popular models by very popular photographers. They obviously want to have these nice photos in their collection and don't hurry to delete them. But meanwhile they infringe the copyrights of the authors and every buyer who downloaded some of these images actually don't have a legit license to use them.