Yes, we can. This morning I found two six cube storage shelves at Goodwill. They were wobbly but for 3.99 each, I thought I'd take the chance and try to fix them.
Unfortunately, it wasn't as easy as tightening some screws. I looked online to see if there was a solution. I saw a reddit post where someone stated most people do not nail the back on these which is important to it's stability.
I was lucky enough to find two pieces of paneling that fit perfectly on the bottom half. It worked.