This is the Skrzynia skarbów icon for Windows 10. Here we go. Optimized for 32x32 px, these are the simplest icons in the line style. Downloadable formats are PNG and SVG, among others. Icons8 icon pack is unique in providing a huge number of icons designed by the same team of four designers who create the new icons every working day in the same style and with the same quality. Same cool as the Bat Face, huh.
The icons shape is a rectangle with two circle segments at the bottom right and left corners, a semi oval at the top center with a dot in the middle. On top of the rectangle is a cloud like shape the looks like it is popping out the top. Two other rectangle shapes make up the lid of the icon.