About returning internet equipment, unsure whether it was returned by my ex-partner and cannot confirm it myself

Hello!

I had a KPN home wifi subscription from october 2024 - february 2026, when I lived in the Netherlands. I emigrated on feb 26, and cancelled my subscription, but I had to move before I got an email about returning the equipment. My (now ex)-partner (whom I lived with) was supposed to return the equipment by bringing it (the router & cables etc) to a KPN store, but I am unsure of whether that happened or not and I cannot confirm this since I am in a different country and we no longer talk to each other.

I’ve now received an email to return the equipment or I’ll have to pay a fine, but what am I to do if I believe that the equipment has been returned but cannot confirm this? What if it hasn’t been and cannot be returned either? Is there some one-time fee I must pay then for the lost equipment?

Thank you for taking the time to answer this message.