THE DOG Bottle Caps!? Set of 6 Purchased and stored a long time ago. They were stored unopened, but I opened them to check the condition inside because the outer transparent case was yellowed. There is some slight stickiness on the white parts of the bottle caps. The stickiness disappeared after wiping with a wet wipe. The contents appear slightly yellowed. Personally, I don't mind it much, but please refrain from purchasing if you are concerned. Each bottle cap has a transparent case and a sticker inside. For reference, I opened the lid of only one and checked the contents of the sticker. I haven't opened the lids of the other five, so I haven't confirmed the contents, but I can confirm that stickers are included. It is unknown how usable the stickers inside are. These are from over 15 years ago, so I will sell them to those who understand.