Letterbox Slot Clearance Sequence

Using [letterbox measurements], [parcel dimensions] and [viewing notes], show the closed flap, opening envelope and interior in three views without forcing a parcel through. Distinguish exterior slot size from internal usable space and flap clearance. Do not claim a parcel fits from the front opening alone or infer delivery guarantees. Unless a duration is specified, use 12 seconds with three clear four-second beats. Provide reference, camera and continuity notes.

Confirm required reference images and timing inputs are present before generating. Keep objects, identities, spatial relationships and light direction consistent. Render the clip when video generation is supported; otherwise supply a timed shot list, reference checklist and generation-ready prompt, labeled as a production plan. Do not claim rendered output without an actual file. Check the opening, transition and final frame against the stated counts and geometry.