Sorry Jayne, you're quite correct. It was Lizzie-1234 on ebay who gave permission. thesecretupbaord also listed a not-dissimilar blue trinket set and gave permission, I just got my etsy database mixed up with my ebay database on this occasion.
I'll certainly take to heart your point linking to an active ebay listing initially to see if there is already an ID.
The biggest problem I can see with linking to live ebay listings is that it may alert other potential bidders to a 'bargain', which may be good business for the seller but not necessarily to the advantage of the the bidder.
In future, I will ask for premission while the auction is still live, but wait until the auction has finished before posting pics.
P.S., Lizzie-1234 asked to be notified if we did come up with an ID. Do you want me to do it, or will you? If I'm to do it, how long do you want me to wait for?