Some criminals may use the following tricks to pretend to be maintenance personnel and steal computer equipment in office buildings: 1. **Disguise as maintenance company employees**: They may wear maintenance company uniforms, carry tool boxes, or even bring fake work orders or business cards to increase credibility. 2. **Collect information in advance**: Obtain the maintenance process, contact phone numbers and work arrangements in the office building through investigation or social engineering means so that they can pass smoothly when they appear. 3. **Create an emergency**: Disguise as an emergency maintenance personnel, claiming that the equipment needs to be checked or repaired immediately, so that employees agree to let them in under pressure. 4. **Use technical means**: Use professional terms or technical language to increase professionalism and make employees feel that they are qualified maintenance personnel. 5. **Pretend to conduct routine inspections**: Take the initiative to ask employees about the use of equipment and initiate routine inspections to take the opportunity to access and obtain computer equipment. 6. **Take advantage of others' trust**: If internal employees or managers accidentally let down their guard, they may inadvertently help them gain access. 7. **Create identity confusion**: They may pretend to be multiple roles at the same time, such as technical support and security auditors, to increase confusion. 8. **Prepare false company documents**: Carry forged maintenance documents or service contracts to enhance credibility through these documents. 9. **Take advantage of peak hours**: Choose to act during busy hours when the office building is crowded or reduces the risk of being suspected. To prevent this, office buildings should establish a strict visitor management system, strengthen employee training on safety common sense, increase vigilance, and verify the identity of visiting maintenance personnel.