Returning an assembled item policy (USA) or a solution to my condundrum.

So I bought a Kallax the other day, assembled and super happy with the functionality, but I got the wrong color. I bought black when I should have bought white. I don't have the ability to return the assembled item on my own and I don't know if they'd allow me to just exchange it for a different color (I know the glossy white is a bit more expensive but I'd pay the difference if allowed) so I'd like to be sure I understand the policy before I attempt to enlist help. This would be to the store in Tempe if that makes a difference.

Alternatively, are there any suggestions to avoid a return? My issue is I bought the Kallax to use as a handbag and shoe shelf in my closet and with the black it's just terribly hard to see what's in the cubbies. Is painting a good solution? I was contemplating just painting the insides of the cubbies and leaving the rest black. Thoughts?

Also I saw a post here a bit ago about some Better Homes & Gardens shelf inserts that work with the Kallax dimensions (and are cheap to boot) but I can't find the link. Does anyone have it?

Thank you!