Interesting. Do you review for a big company or just a smaller independent type of review? I've seen videos of review copies with banners on the case art that says REVIEW COPY on it, so I'm not really sure.
I don't do it anymore, but when I did, it was for a smaller now-defunct web site. Many of the big sites have dev units that allow them to download the games, so I'm not sure how many of them actually get physical copies. But from what I've seen when speaking to other journalists and bloggers, it seems like most of them receive normal store copies like I always did. They would sometimes have "Review copy" (or similar) stickers slapped on them, but that's about it.