Nick would gladly tell you, but his carpel tunnel flairs up if he hits the keyboard too much.
First tap the egg cartons or toilet paper rolls against the side of the container to knock all the roaches out. Then tilt the box up on one end a bit and take a paint scraper or spatula and scrape all the roaches, detritus, and whatever to the high end of the box, most of the live roaches will squirm, walk, or run ending up on the lower end of the box. Do this several times, then start scooping out the unwanted matter into another smaller container. If you only scoop out small amounts at one time you will be able to see and remove the very small roaches left in the debris as you go. When emptying the small container of debris, shake out small amounts as you go and you will be able to pull out any small roaches you missed.
Nick this is the last time I'm helping you out!!
Cheers