The first thing I would do is find out if the couple is registered anywhere. If they are, you can go to the store in which they are registered and ask for their registry, which will be basically a list of all the things they need or would like to recieve as wedding presents. Your safest thing to do is to purchase something directly from this list.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.