Eamonn O Brien
"Before you post" section from An Post website...
Ask for a Registered Post label at your local Post Office. Declare the accurate value of the item you are sending. Attach the correct postage on to your item. Hand the item over the counter. Your transaction receipt is proof of posting and includes the Track & Trace ID number to track your item. **** If you require evidence to whom the item was sent please ask for a Certificate of Posting at the time of posting
This would suggest that a certificate of posting is an optional extra after paying for registered mail... No?