Just a slide-open box. I remember agonizing over breaking the original 'cross' seal (two long strips, sealed w/ a sticker I think), but then got Roger's blessing to put scans on the site, so I pulled the trigger. Then some fool had to take my low-res scans and print up some bootlegs, so I took them down for a long time.
I have various other things - I think the 'Series II "delta"' pack and a couple other things, but over the years they seem to have been scattered hither and yon around the vault. :/
As far as more details on the box... I think the overlays each have a paper separator, and there's some padding and cardstock to protected the top and the bottom of the stack. The box is just the right size. I can't recall if it came with a checklist or not. I also have the poster and maybe some other stuff. Reminds me, I should frame that and hang it up.