Planitherm sealed units wrong way round?

Just erected a DIY conservatory with Planitherm sealed units. All went well until I read somewhere that the units should always be installed with their labels facing inside. Think I might well have done the majority the other way round but I can't tell which as I've taken the labels off! Must they all be removed and re-installed and if so how can I tell which side is coated? Or will they be ok and just not be quite as efficient? Or............

 

Ignore that - someone with better eyes than me has been able to spot where the labels were - re-installing the rogue ones.

Cheers.