Where is the warranty certificate for my Nintendo Switch 2?

I subscribed for internet at home from KPN and selected Nintendo Switch 2 as a welcome gift.

A day before the delivery I received below information via e-mail:

Warranty certificate

In the box, you will find an envelope with a letter from KPN and the warranty certificate for the Nintendo Switch 2.

Keep this warranty certificate safe: you are entitled to a 2-year warranty only with this document. The letter contains a full explanation of how this warranty works.

Unfortunately only a letter from KPN came out in an envelope in the box with the Switch 2 (which describes the conditions etc only, nothing special or unique) but no certificate neither in the box nor in the letter. I just had a call with KPN customer service and they told me that Nintendo is handling the warranty and if needed I can show them my contract. This doesn’t make any sense to be honest, I may gift this to someone else and would need that certificate and expecting to receive it as it is explicitly mentioned to keep it safe.

Am I tripping here? How I can get the certificate?