Source For Boxes?

It was worth a shot.  Thanks for looking!!

Yep, ran into a similar issue.  It's hard to find the right size boxes.

If you are going to ship it, your grocery store may have  a box close to that size or a larger one which may be cut to size. 

If it is a matter of wanting a box to use for home storage, building your own is relatively easy - I do it all the time not only for individual items but also for train sets I want to keep together after running/display.  What you need is a good piece of cardboard, a tape measure, a hot glue gun, a t-square, and an Exacto knife.  Below is an example of what one of my "set boxes" looks like.

@Robert S. Butler posted:

If it is a matter of wanting a box to use for home storage, building your own is relatively easy - I do it all the time not only for individual items but also for train sets I want to keep together after running/display.  What you need is a good piece of cardboard, a tape measure, a hot glue gun, a t-square, and an Exacto knife.  Below is an example of what one of my "set boxes" looks like.

I use double corrugated cardboard sheets, a utility knife, a large square and craft glue.  It used to be fun but it becomes tedious after a while.

Yes, it can become tedious but, for me, it is worth the effort.  This is particularly true when I'm building a set box for a lithographed train set.  Many lithographed trains have a finish that can be damaged by storing them in any kind of wrapping or by storing them on their side.  In those instances I make a box like the one illustrated and I build the box so everything sits in a vertical position. I don't wrap the set in anything and I cut the partitions so the car couplers are caught in a notch at either end of their respective cardboard storage spaces. This prevents the cars from moving.

Thanks all.  Talk about kismet.  I was putting something away in the garage.  As I turned around, I see the bottom of a folded up box.  16x13x10.  It's from Chewy.com.  The Lionel box fits perfectly inside it with about 1/2" on the width.  Happy holidays to all.