I don't believe you do. In the UK you get the value of your finds, but in Sweden I'm fairly certain they use a few factors to determine the award and it is usually quite small (in comparison to the value of the find if it's precious metals). I'd have to check into it again; I had researched it a few years ago when I was visiting and was thinking of bringing my detector. Quickly learned I couldn't.

Unfortunately Sweden has pretty much nuked amateur metal detecting which will heavily reduce the number of finds. You're not even able to detect on your own property. Unlike the UK, who actively promote it and generously reward any significant finds. People are more likely to now melt a find down since they would receive little reward for turning it in, and there's the possibility of being fined depending on the circumstanes of the discovery. The worst part is that these laws only impact folks who love history and want to report their finds and have no impact on nighthawks since they will be detecting and stealing regardless.