I could've sworn I saw something about accidentally making a multiple account results in no ban... I'm not sure if that was Jitspoe saying it to some newbie or something but I for some reason recall it.
Considering he never activated it, which means he never logged into it, I don't see how this can result in a ban. The only way you could justify a ban in my opinion is saying: Since you're merging the accounts to give him the lower player ID, it's like he had 2 accounts, or something along those lines. So really if you merge it should be 8 days, otherwise it should just not be a ban. I still don't think there should be a ban, but that's just how I see it. The fact it was never activated is the main reason for my opinion.