Unless you use specific materials that Unity supports, (this being Principled BSDF node, image node and Material Output in blender) materials and textures are not linked on import and textures need to be assigned to materials. Your models are named computer1-8, but your materials are named defaultMat 1-7 and textures are named MachineTexture1-8. At the same time computer1 material is defaultMat7 (not 1), computer2 materials is defaultMat (not defaultMa 2), etc. While not impossible, it was quite annoying to match them.
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Word! I know this doesn't help you out but I'm going to come back to this and fix these issues hopefully this weekend. I'm pretty novice at making 3D assets and this was my first one. I've for sure learned a lot since making these but still have a lot to get under my belt when it comes to texturing. Not naming the materials "Computer1-8" was for sure a misstep and I'll be able to fix that easily. linking textures to materials is something I'm going to have to watch a tutorial for but I'll try to learn that in blender this weekend.