When the interior is plywood how do they finish it? What color are the inside of the boxes?

Can anyone post a picture of their plywood boxes?

Thanks

Just looking at cabinets, you won't be able to tell whether the boxes are furniture board or plywood without further investigation. They look the same because what you see is veneer regardless of what's under the veneer.

Also what would be better for drawers between melamine or metal?

MDF and furniture board are not the same thing. In cabinetry, you will find furniture board used for the carcase and MDF used for door panels.

MDF (Medium Density Fiberboard) is a homogeneous board made from wood fibers.

Furniture board is the same thing as "particle board" (known as "chipboard" outside North America), and is made from larger wood chips. Particle board comes in many grades, from outrageously shoddy through very good; quality cabinets use the very good stuff.

People get way too hung up on the supposed virtues of plywood over furniture board. In reality, with appropriate construction methods and proper installation, either can be used to create cabinets that will last decades.

The biggest real-world difference I can think of is weight - plywood is significantly lighter than furniture board; upper cabinets made of plywood are easier to install.

But do avoid particle board or MDF or whatever it's called for drawers. They work too hard.

(My painted cabinets had painted interiors.)

True, but I was using terms people recognize without caring exactly what the stuff is. It doesn't help that "furniture board" isn't a specific compositional material - it's a name given to the good stuff that's used in good cabinets. You're absolutely right about plywood, furniture board, and mdf being available in everything from incredibly cheap to really lovely. Think about the cheapest plywood available used to cover a broken window vs the much finer variety that can be veneered with a lovely outside and used to make good furniture. The same is true for mdf. My daughter has an ottoman that goes with a rocking chair that broke when her toddler climbed on it. When we took it apart to repair it, the stuff under the fabric was almost sawdust. That is not what they use in quality cabinetry.