I was at christies 2 weeks ago in London and there they mentioned there is a total embargo to France with ivory items. It must have been a very new rule because they told it before every item containing ivory.
Since I collect ivoryitems I was keen-eared on this topic.
Ps: So the workaround would be to fly to Germany your purchase, drive by car to france and forget things in the glove box or in the backseat.