Started a game in shipwrecked, merged it with an RoG character from before I downloaded shipwrecked. It was a fully upgraded WX replaced by a Wilson (my fault), and in its second world. The inventory grave resets every time I quit and come back, giving me infinite copies of those items.
1. 2nd world fully upgraded WX 2. Shipwrecked 3. Merge 4. Dig grave and save and quit 5. Repeat