Well, the simplest solution is to clearly state what, if anything, they've done - saying "they gave me a review copy" clears everything up, if all they did was

Well, the simplest solution is to clearly state what, if anything, they've done - saying "they gave me a review copy" clears everything up, if all they did was give you a review copy. I'm pretty sure they have a quite in-depth statement of what you can and can't do, but I would expect that clearly stating what's going on at the start of each review would be enough.