I loved a similar sliding box I've printed before. This is more in that style - though it lacks the satisfying 'click' closure.

I've designed it so that it should be printable with no supports.

This was made for the Thangs Valentine’s Day Contest - a Remix of Simple Heart Box with Lid by 3dprintbunny

I made another version with tighter tolerances (0.2mm vs 0.4mm), but have no idea how to add them as additional files you could optionally download. The print turned out just fine though - photos attached.