Why not contact the council!
Apart from anything else it attempts to summarise the situation, sets out the procedure for your benefit, gives them feedback and lodges a request to be notified by email.
All they could say is no!
Dear Sir,
PCN ********
I made representations against the NTO for the above on **** and recently received a Charge Certificate. This prompted me to check on your website and I can see that you issued a Notice of Rejection on ****.
It is my intention to submit a Statutory Declaration to the effect that I made representations but did not receive a response which, if made in time, would engage the procedure for Invalid Notices. My worry is that as one letter has gone astray this could happen to any Order for Recovery, but my concerns would be allayed if I knew when the OfR was sent as I would be able to download the necessary document and action at my end whether the order arrives or not.
In short, I am not seeking to step outside procedure or debate your decision on my representations, I am merely giving you feedback with a request that you would email me when the OfR is issued.
Hugs