It's very likely that all the zipfiles are either autogenerated fakes or viruses/malware. I bet that all those zipfiles are less than 1 MB in size as well.

This happens a lot when searching something that is nowhere to be found. Also by searching in the all files section of the search you allow for this to happen.

Either use the audio or video section to search depending on what you are looking for or add the extension that you are looking for eg. .mp3