The Coffins are gone and Hollow Warriors have taken their place.
Find them on your Free Gift page and send them to your mafia.
They are also on the Link-a-Nator and Get-a-Nator.
You can open 5 of them a day. So far this is what I got. I was very happy to get the Island Hopper which is the Grand Prize. Hopefully I will get more! Please comment here if you find additional items.