Almost everything has been purchased from the registry, save for tiny things like individual spatulas and big things like the Ninja system.
FI's family makes up 75% of the guest list, and let's just say they did not look at the registry for the gifts I received at my shower.
So if they're not going to use it, maybe it doesn't matter - - but maybe it will cut down on the random things from them if I fill it out with more on the registry?
They don't seem to be "check in a card" people, which is surprising considering it's not so far from where I come from! Also I've had a bunch of stuff sent to our house from that side in the last week.