/3/ - 3DCG

>>772131
Good enough for a base. You can just put a 2-segment-bevel in front of the subdiv and mark all hard edges with it, keeping them in shape. This requires okay-ish geometry and a few support loops, but that shouldn't be too hard with that shape.
If you're going for a subdiv workflow you might want to re-create the round corners near the hinge with a low-vertex version

Alternatively you could just use the bevel (1 segment) and fix the shading with face-weighted normals (modifier) which would be easy for this hard-surface object