We had the interview on Wednesday - and really worried yesterday because we hadn't gotten all of the goods in the mail yet! But this morning (finally!) it came... and it is SO pretty! Not just an ugly stamp like my FLR, it looks a lot like my fiancee visa. Very nice.
It came with a letter explaining what to do upon entry to the US, and all about tax and conditional status and social security numbers. The sealed brown envelope is neat too, with his photo glued to the front.