Interesting. The custom here in the US is you definitely do not open the presents at the wedding reception. They are piled on a table or in a nearby room, and the bride and groom open them later at their leisure (and send thank-you cards, hopefully.) But I, too, have never heard of giving a wedding present to someone if you're not invited to the wedding (unless of course you're giving the present at a wedding shower that someone is throwing instead, in which case you've still been invited to an event of some sort.)
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