Don't know about France but a google search shows some in Geneva:

HL Service Point
Sous-sol, Rue du Mont-Blanc 30 · 0848 711 711
Closed ⋅ Opens 9:30 am Fri

DHL Service Point (Pharmacie de Saint-Leger)
Bd des Philosophes 15 · 0848 711 711
Closed ⋅ Opens 7:45 am Fri

DHL Service Point (Profess Herter Karin SA)
Bd du Pont-d'Arve 57 · 0848 711 711
Closed ⋅ Opens 9 am Fri

Am not familiar with service points in France

Would this be any help?

https://www.dhl.com/fr-en/home/customer-service/dhl-ecommerce-servicepoint-finder-for-e-commerce-pickups-and-returns.html

If not i would do a big search for a telephone number of some type for DHL in France

Otherwise, I would probably go and ask in a post office or local mairie in case someone kind there might help me.

Another idea maybe go to the main DHL depot at the airport here in Geneva - can find their address on the internet - and ask in their offfice there if they have a telephone number or other information regarding DHl French services. 

Hi,

Thanks for the help! I needed to ship a package back from France (it was initially sent to me here.) I've found a place that can assist me in contacting DHL to pick up my package—Mail Boxes Etc. - Centre MBE 2535.

Yan

Thank you for this!! 

 I've found a place that can assist me in contacting DHL to pick up my package—Mail Boxes Etc. - Centre MBE 2535.

Yan