Most of them probably aren't worth shit anymore. WotC has been printing all sorts of new product for the modern format that has imploded the secondary market in the last few years. Unless you had legacy relevant cards, you probably would just have valueless bookmarks these days.
They also have all my systems. I kept boxes and manuals for everything in ziplock bags in boxes i the attic, all original packaging uncluding the inserts such as styrafoam