Hi @sangster ,
Thank you for your post.
As knives are considered a bladed item it is part of policy that the postage offered on the listing would need to be postage that has age verification with it. These items are not allowed to be sold to persons under the age of 18 so it requires the age to be verified upon delivery. There should be an option to revise the listing and in the postage section an age verification option needs to be selected.
Thank you,
Kat