# TLDR Review: Master Lock 5423D Lock Box

*Published: 2025-04-01 | Updated: 2025-04-01 | Source: https://shopsavvy.com/reviews-tldr/master-lock-5423d-lock-box*

---

## Product: Master Lock 5423D Lock Box
**Brand:** Master Lock

## Pros
- Extremely durable and reliable, with one unit lasting over four years in outdoor settings.
- Easy to use, especially in low light conditions due to the mechanical keypad design.
- Offers a high degree of customization with twelve buttons, allowing multiple code combinations.
- Features a hanging hook for storing keys conveniently.
- Suitable for emergency home access, providing security for family and emergency workers.
- Improved security with the ability to be screwed onto a wall.
- Reduces temptation for thieves as it is more secure and difficult to pry open.
- Sturdy and strong, ideal for outdoor use.

## Cons
- The lock box often fails to open, even with the correct code, indicating a possible design flaw.
- The plastic turnkey pins are fragile, and the tool is considered flimsy.
- The design allows any order of the same numbers to unlock it, compromising security.
- The code mechanism’s inability to use each number more than once limits the combinations available.
- Lacks masonry anchoring points for brick mounting; only timber screws are provided.
- Issues with performance in cold weather suggest potential problems over time.
- Users report difficulty removing the lock box due to internal fastening bolts.
- The lock often sticks, leading to unreliable operation.

## Bottom Line

While the Master Lock 5423D offers some promising features like durability, ease of use, and improved security, its frequent functional failures and security concerns cannot be overlooked. Many users have reported issues with it failing to open, even with the correct code, which undermines its key function. Unless resolved, these issues make the lock box a risky buy for those who prioritize security and reliability in their key storage solution. Consider these factors carefully before purchasing.

## Pros vs Cons at a Glance

| Pros | Cons |
|------|------|
| Extremely durable and reliable, with one unit lasting over four years in outdoor settings. | The lock box often fails to open, even with the correct code, indicating a possible design flaw. |
| Easy to use, especially in low light conditions due to the mechanical keypad design. | The plastic turnkey pins are fragile, and the tool is considered flimsy. |
| Offers a high degree of customization with twelve buttons, allowing multiple code combinations. | The design allows any order of the same numbers to unlock it, compromising security. |
| Features a hanging hook for storing keys conveniently. | The code mechanism’s inability to use each number more than once limits the combinations available. |
| Suitable for emergency home access, providing security for family and emergency workers. | Lacks masonry anchoring points for brick mounting; only timber screws are provided. |
| Improved security with the ability to be screwed onto a wall. | Issues with performance in cold weather suggest potential problems over time. |
| Reduces temptation for thieves as it is more secure and difficult to pry open. | Users report difficulty removing the lock box due to internal fastening bolts. |
| Sturdy and strong, ideal for outdoor use. | The lock often sticks, leading to unreliable operation. |

## Current Prices

| Retailer | Price | Availability |
|----------|-------|-------------|
| Zunsnonline | $23.98  | Check |
| Amazon | $26.29  | Check |
| Bonanza | $29.70  | Check |
| Opentip.com | $32.72  | Check |
| Menards | $33.99  | Check |
| Walmart | $34.40  | Check |
| mrosupreme.com | $34.54  | Check |
| spsindustrial.com | $39.85  | Check |
| The Home Depot | $39.98  | Check |
| FloorMatShop | $39.99  | Check |
| Max Warehouse | $39.99  | Check |
| officeonspot.com | $39.99  | Check |
| shop.com | $39.99  | Check |
| Taylor Security & Lock | $39.99  | Check |
| The Power Tool Store | $39.99  | Check |
| UnbeatableSale | $39.99  | Check |
| Zoro | $39.99  | Check |
| Zoro Tools Industrial Supplies | $39.99  | Check |
| Ideal True Value Home Center | $40.00  | Check |
| MrLock.com | $40.85  | Check |

---

*About this review: We pulled together findings from professional and user reviews, and cross-referenced them with ShopSavvy's pricing data from thousands of retailers to give you the short version.*