You made a deal with the seller where you paid them to get the thing or things to you. Unless you explicitly agreed that you would assume the risk of it not arriving then it's all on them to ensure delivery by whatever means they chose.
So if it is lost in transit then by default they are responsible for a full refund.
-- Bleep

He now opened a complain to search the package at the postoffice.
When i asked to him if he's gonna refund me in case the package is totally lost he answered:
"Unfortunetly you never asked for insured shipping mate ... So i won't be able to do that ...Deeply sorry :/"

i payed as friendly payment on paypal, ill never do it again probably