With regards to the model:

File:
Blende 2.79

Render engine: 
Cycles

Texturing and shaders: 
Unwrapped, mixed 
All principled shaders 
All images are JPG - images range from 256x256, 512x512 and 1024x1024

Objects are grouped by type: 
1. checkout-counter 
2. Groceries 
3. Shopping_basket 
4. Trolley

Importing the scene individual elements: 
In blender, use the >file>append>group>group name tool to specifically bring in only individual elements

Please feel free to comment, make suggestions, call for additions to the pack - I will be happy to assist where i can, 
above all, 
Enjoy the model - if you like it please rate it.