The rectangle box with a cross signals something’s off or blocked. Use 📦❌🔒 when a package is locked or unavailable, and 📦🚫🛑 for shipments that hit a hard stop. It’s common in customer service chats and shipping updates where clarity matters fast. Combine with 🔲 for a visual 'no entry' vibe or 📦📭❌ to show mail that never made it out. Straightforward and a little tense.