I recently purchased a pair of Yamaha HS80M Studio Monitors (according to the listing title and item description) from Reverb.com using their app for iPhone. If I had been on a computer, I would have seen that the seller's images were of Yamaha HS50M, the 5" version. The HS80M is an 8" driver. The seller used a wide angle camera lens to make them look bigger.
Fortunately, I filed a claim with Reverb’s buyer protection before the site’s 7-day (oh well, too bad for you) window had passed and thoroughly documented everything. I got a refund for the full purchase price plus a pair of 5" studio monitors that I guess will make great garage workshop speakers.