opkg update
opkg list |grep unzip
unzip - 5.52-1 - InfoZIP's unzip program. With the exception of multi-volume archives (ie, .ZIP files that are split across several disks using PKZIP's /& option), this can handle any file produced either by PKZIP, or the corresponding InfoZIP zip program.
opkg install unzip
BTW, this is public forum you could utilize it to put multiple horses on the race track instead of only two. 