There are two sources for Zip and Unzip for OS/2. One is infozip itself, and the other is Paul Smedley's Linux ports website.
610808 May 26 2009 unz600.exe UnZip 6.0, OS/2 32-bit and DLL 362917 May 26 2009 zip300c.zip Zip 3.0, OS/2 16 and 32-bit exes (no encryption)
Although the readme says zip has no encryption, zipcloak.exe is supplied, unzip documents the -P parameter that would imply encryption and decryption.
zip30-os2-20100814.zip (302,541 bytes)
unzip60-os2-20100530.zip (102,201 bytes)