Use a site called Peeron. A link to the instructions can be found below (copy+paste into the address bar of your browser) http://peeron.com/cgi-bin/invcgis/scans/8621-1?ct=1.
Type in 'Bionicle Boxor Instructions' then press 'ManuelsMania-Lego-Bionicle: Boxor: BI 8556/2-Bionicle: Boxor...' Then it should come up. Hope that helped!
Try Amazon or Ebay Target used to sell them, but not anymore.
on youtube
there were no instructions in the whole life. But the creator of the set built it.
We found something at The Bionicle Website and on Lego.com for download. That answers your question. Good luck.
You can download them on Lego.com
Go to: www.bionicle.com, thenlook for it`s building instrustions.
Building instructions for most if not all BIONICLE sets can be downloaded from the Building Instructions area of the related link below.
On bionicle.com at the bottom of the start page where it says find building instructions for new or older sets.
The LEGO Company has made building instructions for LEGO BIONICLE set Krekka available for download in PDF format here: http://cache.lego.com/bigdownloads/buildinginstructions/4280179.pdf
After a lot of searching, I eventually found this website which appears to list all the Bionocle (plus others) instructions. Hope this helps......Here's the link...http://www.worldbricks.com/lego/lego-instructions/by-theme/bionicle