I got the same harbor freight box. Just the lower and the first drawer had the holes to add a extra slide. I added the slide and got 2 more swivel caster. I use it as my tool cart

I got the lower (in blue). The upper I will purchase when future growth calls for it. Get the magnetic attachments (tray, spray can attachment, power tool holder) It's a great option to put the sides of the box to use.

You moved out to a new location ?