This is a paid asset, but now you can download Low Poly Gift Box Isometric Free.
Detail this asset from Unity Store: Original Link
Low Poly Gift Box Isometric VR / AR
Rendering standard in Cinema 4D. Texture file size(2048*2048), You can easily adjust the color by dragging the uv. Model ready for game, render, motion graphics..e.t.c. This package contains many different types of low poly gift boxes.