They are still there but just sent this message.
"Hi Leanne, yep we sent something yesterday. I'll check with the team tomorrow and get them to send again. Do you have another address we can use at all? Or a phone number we can call tomorrow?
Woops sorry, missed you last message. Thanks for those other email addresses. Is there a number we can contact you on too?"
I've scoured both my emails and there is nothing in the inbox, junk or trash.
So I think I won! Thanks in anticipation for posting that comp JRN!
In the web version of Facebook select Messages on the left hand side. Then select the "Other" folder that should open up under Messages - this is where messages from people you don't know end up. See if there is something in there.