I've gotten very negative reactions from most ebay sellers when I've asked them to pull a key cap and take a picture. Some won't "be bothered" to do it, and vintage computer people just ignore you like you're some kind of key cap scavenging pariah.
Which I might be. Did you see that awesome "Data General Dasher Mdl D-200" on ebay with the beautiful blue keyboard? Still no response from that seller.