It's actually new to me they offer insured shipping for metals these days. Been a while since I last posted outside Finland and then it was mentioned in their terms, if I remember correctly, that sending metals is not allowed. I just sent registered mail knowing I will take a beating if something goes wrong.
Can imagine the 'new' insured service being expensive since these guys take something like 20-25€ for insured delivery within Finland, so perhaps 2-3 times that.
I think DHL did not insure metals last time I checked.
I will also be interested to hear what the Posti guys say