This is a bundled release of Chrono Trigger and Chrono Cross that was never available for retail sale.
wizzy0807: This was sold online by auction a few years back: here. You can view a different photo there. It is described as: "This is a special promotional set with both games. The NOT FOR SALE mention is on the box." A blog entry described Chrono Memorial as a promotion gift for a "DigiCube" pre-order? (check this). froodo was able to provide more information in July 2020. Only 3000 were made, and could only be obtained by pre ordering both Chrono Trigger and Chrono Cross at FamilyMart stores in Japan.
The items themselves look like partially repackaged products. The UPC on Chrono Trigger, if my eyes are sharp enough, is 4961012997060, which is identical to the original Japanese PS release. Likewise, I get 4961012997077 for Chrono Cross, also identical to the original release. Seems like the discs were newly pressed and designed as vols. 1 and 2 of the box set, but the jewel cases, manuals, and jewel case "spine slips" look like reproductions of original PS releases.
More information can be found at this thread.