OK. In Sweden we have a special authority just for taxes (of course), but since most documents here are official, anyone can call them and ask for a person they are searching. Since 1946, every citizen has a personal number and if you know that number you can get most information of him/her you want. 
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Let come what will, I'll try it on,
My condition can't be worse;
And if there's money in that box,
'Tis munny in my purse.