I live in Florida, my shower was in Connecticut
I registered on Amazon, so free shipping for most items. Most people "got it" but I still received multi-packs of diapers ( and I cloth diapered to boot) and several larger items. I spent two days returning as much as possible and a third day figuring out how to get the rest home!
Make sure you have two or three days after your shower to deal with this, it's not worth it to pay to ship most bulky items so you'll need to return stuff if your shower was anything like mine
It is super tacky though to request guests ship items to you on the invite. They want to see you open everything and be there for the ohh's and ahh's and if that makes it inconvenient , tough noogies