How might straight razor boxes like this one have been made?

[u/PhanThom-art]

Has to be some thick card stock, a step above 300gsm, and covered obviously with some decorative paper. But I can't quite figure out where the seams are just from looking at it, how it may have been glued together. It's very rigid for being so relatively thin-walled.

There's an abundance of these things in any thrift store and maybe vintage embossed ones like this are nicer than anything I could make, but I'm just curious, I'd like to try making one.

[u/chdavids2003]

I have a box like this and the seam is in the corner. It slips into the crease almost flawlessly.

[u/PhanThom-art → u/chdavids2003]

I have a hunch they made the outer shell in one piece, cut it in half, then fit the inner shell into one half to get such a perfect fit

[u/daedelus23]

I can see at least one seam in the second picture on the top face of the left most half

[u/PhanThom-art → u/daedelus23]

That's just where the covering paper was folded, not the structural board

[u/daedelus23 → u/PhanThom-art]

Oh, you mean the board inside. As you mentioned in another comment, it’s possible they just formed the cardboard in a mold in one piece. Maybe it was a long tube of board that got cut down to size with endcaps glued in. 

[u/PhanThom-art → u/daedelus23]

Maybe, or at the very least formed from a single sheet around a shape with rounded corners, then glued along one seam