@Dimitrios Samaras Hi and welcome here! Thank you for your topic. First of all, sorry for our late reply. It is very busy here lately.
Hmm.. that is quite odd that the power adapter is missing. Thanks for already filling in your details in your profile. I will inform the mechanic department and ask them to bring a spare power adapter for your fiber box to the appointment on the 7th of march. 
By the way, they always bring some spare ‘things’ just to be sure, so maybe this is already ‘a thing’ they bring along. 

EDIT 17.09uur: Meanwhile you contacted a different customer service channel with the same question. I think my colleague understood your wrongly since he sended an power adapter of the V10 Experiabox to you. Don't panic when you received the wrong adapter. I have requested the correct adapter for you by providing them from the pictures you made. Let me know if I can do something else for you! 
 

thank you  @Lisa i have also informed KPN 5 hours ago  through digital assistant 

@Dimitrios Samaras Thank you for your reply. Unfortunately, they requested the wrong adapter for you. This is fixed. You can ignore the packadge because it is the wrong adapter. You can hand it to the mechanic!