Go to the Device Info of any of your devices...
you'll see a URL similar to:
"108" is my example, but you'll have a different number, change that to be "249", press enter and you'll see the device info for it. Then change the URL to use "250" and see what device that is.
Then, on the device list page, in the upper right corner you'll see:
Click on that grey'd out X and it will go Red and a Disable column will appear at the left edge of all your devices. Go find the two identified and click the disabled box next to them.
Obviously if devices 249 and 250 have been removed already by your other work, then you don't have to disable them