I think he died here, because he didn’t know at that time about the spoon trick. After he died a part of him became some kind of entity which is now able to write and draw on the walls. It seems that he discovered the spoon trick, the ink demons lair, etc. after his death and started to leave hints for his physical form, which we play as. I think he drew the coffin on the bed just to us show where he died.

EDIT! EDIT! EDIT! :) :) :)



OR…



Henry died first near the ink machine, right on the first floor. A redditor purposed that it was Hendry himself who boarded up the ink machine room.

https://www.reddit.com/r/BendyAndTheInkMachine/comments/9s2t0r/spoiler_this_is_where_henry_died/e8lnnm9/

This would also make sense. In this case, when Henry first visited the work shop, there were no boards that could have prevented Bendy from harming Henry. So maybe his first death was right at the beginning, on the first floor. In this case he could have drawn the coffin on the bed just as a symbol or a warning. Like, if you stay here you die.