sandbox's source is now apparently packaged as an lzma file, and requires lzma to uncompress, however lzma is not set as a dependency in the 1.3.2 ebuild. This will cause the build to fail if lzma-utils is not already installed.
Created attachment 176438 [details] emerge --info
fixed in the tree, cheers http://sources.gentoo.org/sys-apps/sandbox/sandbox-1.3.2.ebuild?r1=1.1&r2=1.2