Corona version 9
The model uses materials that may not be displayed correctly in very old versions of the engine.

Wall decoration with mailboxes
Mailbox https://www.safetyletterbox.com/moda-system-mailboxes/moda-horizontal-300-mailbox 
Design reference: https://ru.pinterest.com/pin/679621400032214706/ 
The numbers on the boxes are marked with separate cards of 40 numbers.
The archive contains textures with numbers from 101 to 500.
You can always add more variation with these textures.

Objects are partially attached textures and materials have logical names
Texturing UnwrapUVW

For Corona render it is recommended to install a version not lower than 1.5 since the glossiness of materials is configured with PBR in mind

Who works in a V-Ray version lower than 3.1 be careful there is a Microfaset GTR ( GGX) in the materials in the BRDF section if your version is older than 3.1 then the BRDF field will be empty. Choose Blinn Phong or Ward – which is preferable for you