Here are 2 retail display posters, one for Adventure DX, the other for Sonic Heroes. Each one appears to have a date (likely release date) & the Heroes one has pictures of each team at the bottom, likely with a little explanation. The DX one has several screenshots too. These would likely be hung on the walls of a game shop leading up to the game's release to help promote. Photo & owned by: @JapanAnimePosters on Instagram
*All posters in this area are about "B2" size at 20 x 29 inches