A student handed in work I strongly doubt is authentic. How can I verify this?
Thank you for your help 
Trust and experience.
There is no real “technique”.
https://forums.sketchup.com/search?q=plagiarism
- Is it an imported model from another file format (Collada, obj, very common on the internet)?
- Display hidden lines and check that not all faces are triangulated (all rectangles have a diagonal line). Such file formats are usually triangulated, but no person would manually add these diagonals in SketchUp purposely.
- Check the materials browser that there is no “texture atlas” (patches of different materials combined into a single material image).
- In the Desktop version of SketchUp, check the Model Info → Credits section. Imported components from Trimble 3D Warehouse which have credits would list other username here. But unfortunately only a small number of components display credits.
Thanks!