When I was out of town three days ago and needed to kill some time before another shop, I viewed the job board at a certain MSC to see if the store I was resting at had a shop available. Nope. But now a few days later it shows up as "urgent"?
If you didn't see a shop at the location 3 days ago but it is now posted and urgent, it could be that it was assigned to another shopper, who either dropped or failed the shop. That'd be my best guess.