My point is that anything you *can* anneal, you certainly should.
But look around, you'll get advice from certainly knowledgeable people that'll tell you it's OK to bench cool ornaments and in fact, with a sealed container you *should* bench cool it since you run the greater risk of it exploding in the kiln. Ask me how I know, I was glad to have a 4" thick door and lucky that the sealed ornament I made didn't explode in the kiln while I had the door open.
Consider also, that the wall thickness of these is fairly thin, and the amount of glass actually being worked is very small, giving plenty of surface area to dissipate stress should any exist. If it were unworked 4mm walled tubing I'd have a different opinion, but that looks to be fairly thin.
This is one of the few instances where I'd tell someone, just stick it in the blanket and still sleep well at night.
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-Tom
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