This old post my help you..

https://www.eribaforum.co.uk/cgi-bin/topic_show.pl?pid=93997;hl=certificate%20conformity

The address in the thread was for the France factory, the production line moved to Germany in 2012, below is the contact details.

Erwin Hymer Group SE Holzstraße 19 D-88339 Bad Waldsee/GERMANY.
E-Mail: info@erwinhymergroup.com
Web: www.erwinhymergroup.com .
Phone: +49 7524 999-0 Fax: +49 7524 999-220

Hi, I'm not sure if you managed to register your Puck, I know this is a late reply, but... I live in France too, I understand that you don't need a certificate of conformity for France, as the Puck is under 550 kilos, so you don't need to register it as you would with a bigger caravan.
UK market caravans have a door the opens on the left - continental on the right, as I am sure that you know, so a UK caravan cannot be registered in France, I was reliably informed,
as the door opens onto the traffic side.
That is all received information, and is to the best of my knowledge, correct. I'm just about to buy a French model Puck, and the owners told me the only important thing to do was tell the insurance company I would be towing an Eriba Puck.
Do let me know what happened.
Regards
GB