I understand the sentiment, but sometimes you have to take these things with a grain of salt. There are some folks out there who will NEVER be satisfied, no matter how well the seller describes or provides pictures of something. It's like they buy it and have buyer's remorse, then immediately look for something to complain about so they can send it back.
If you see a seller with hundreds of transactions, and one or two from way back are negative, I wouldn't sweat it. The law of averages results in a couple of knuckleheads no matter how straightforward your transactions.
Definitely ask questions and ask for additional pictures if you need them. If the seller takes a long time to respond, or REFUSES to provide additional info/pics (like one of the biggest sellers on Auctionarms does), then screw 'em. Take your business elsewhere.