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Call again.  I don't suppose there's any way to find out who took your mail?  If it happens more than once, get one of those fake surveillance cameras, or if you have money to spend on extravagances, get a real surveillance camera.  If important mail that you are expecting starts going missing, rent out a PO box at your post office and use that.  You can get a mailbox sized box for about $40 a year, which can be paid for in 6 month intervals if you wish.

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We almost always get mail at my house too.  But once in a blue moon, we don't.  It's not like it's impossible.