Love our new bed! 3 large boxes, headboard must be 100lbs! My husband assembled in 1.5 hours without instructions as theirs are useless. Wish they had more than 3 slats to hold bed for support( were both thin but worry it could snap) We have a 10” mattress and 8” box spring. Just comes to bottom of headboard pad. 
FYI the distance from slats to base of headboard(wood, big hole) is 14”. They don’t have this info online and J&M couldn’t tell me either. Slim profile, there’s maybe 2” of room at footboard unlike other beds that have 4” on all 4 sides. Beautiful wood and cloth color!!