When I was around 12, so early 90's my great aunt passed. The curtains were drawn at my grand house- her sister, pictures and mirrors turned. Everyone in black until after the funeral. No toys, TV, no playing out, quiet reading and preyers only. I remember having to curtsey as her coffin passed by before following on in another car, rosary in hand although not saying a hail Mary but the Lords preyer.
I don't remember a black wreath though and I know her body wasn't lain out at home. Previous relatives had been and being young I wasn't allowed into the room.
I'm not sure about the envelope corner being marked. Was that a Catholic tradition does anyone know?
For my Grandma passing almost three years ago we still drew the curtains. However I was admitted to hospital myself two days after her death and was still there for her funeral three weeks later. I don't think it was as formal as her sisters, certainly no Rosary beads. No idea why it was so different.