I have an easy fix for your particulate egg problem-- the serial number is actually egg008028c024080152 (it appears that you may have been missing a zero in the last group of four digits). I was able to connect to that egg and can see that it is pushing data to OpenSensors, and I was also able to retrieve data for that egg via the download site just now, so the particulate egg seems to be working.
I found that I can’t see data from the CO/NO2 egg via our OpenSensors.io account-- I believe that may be because it was “claimed” by NUIG at some point in the past. That shouldn’t have affected the operation, however-- if both eggs are reporting that they are properly connected to the network, then they should both be sending data to OpenSensors.io. Yodit @ OpenSensors support reported early this morning that everything was looking fine on their end, and I take that to mean that they are able to see your data for that egg coming in? I’ll do a bit more research and see what I can find out.
I have a suspicion that the CO/NO2 egg may not be connecting to WiFi. Could you send me an email with a list of the things you see on the front panel display when you plug it in? I’m particularly interested in the firmware version, but I’d also like to know if the egg eventually enters online mode and begins reporting data.