Having pictures of the back is a good indicator of condition as well. Connections are typically the more fragile side pf any equipment. Bought an amp once where one of the posts was bent, and not very apparent in the photos because of the angle.
Seller Listing Pet Peeve
When I'm viewing for sale ads one of the first things I look for are the connections the particular piece of equipment require or can accommodate.
The latest was a DAC that had many photos of the top, sides, front, even different angles of the same view, but not a single photo of the rear. Yeah, I know I can look it up if I'm that interested but the seller could make that point easy on me.
To me it is critical to understand the options/limitations of a piece of equipment from the very start whether it is an amp, preamp, speakers, DAC, etc.
OK, rant off.