you may have to contact the the manufacturer if you cannot find the manuals anymore. There is certainly a way to do a factory reset and use them with another receiver. Perhaps there is just a software you may need to tell your router where to send the signal.
These cameras will use a specific port; you may just have to re-route this port or even to open the port.
Why not give your IT, as you mentioned, one camera and have him play at home with it...a few days later he/she will want to face the challenge and it may work...
To bin is the last solution......
Perhaps the manufacturer has a solution.