Wavelab 8.5 trial activation question

I’m currently using the WL 8.5 trial, and plan on purchasing it - so I was wondering if, instead of buying the activation code ‘download’ from Steinberg.net, I could buy a boxed hard copy from my local dealer and use its activation code in the trial I’ve already installed (ie., is there anything about trial versions that require they use only downloadable codes). This would save me over $200.00 (I live in Canada, go figure).