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I have gone to Stubhub a few times now to try to replicate this, and searched for tickets for popular NFL and MLB teams, and I can't get this "Sold" thing to work the way this posts shows it - actually it doesn't happen at all for me. Has anyone else been able to replicate the "sold after load" behavior? Is it only on specific events?

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Maybe, they had some other junk about AB test flags and I didn't dig far enough to see how that was set or if it was random from the server. My wild guess is that they turn it on for popular events close to the time of the event, so there is less chance of users noticing.

Yeah, that's likely the case. I do not see the urgency message in my session data for this NFL game (suggesting it won't do it's sold out thing for this event) but I do see something in my local storage called "cache:local:app:urgencyMessageData"

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