I was basically just checking the latest ids (you can estimate it based on the /newest submissions and then increase until you hit the "No such item."-response.

I was basically just checking the latest ids (you can estimate it based on the /newest submissions and then increase until you hit the "No such item."-response. In my case I guess I was lucky that there was not much traffic. However I was on mobile when I started observing the ids but finally switched to PC as I felt on PC I can react much quicker.