That doesn't augur well. I got a notification yesterday but there is nothing on the site yet. It is Sunday in the US so perhaps they will have people working on Monday?
So you got a notification from usps or something that it had arrived at the youshop warehouse? If kiwitrc's package is anything to go by then it sounds like they are majorly backlogged and you won't hear from them anytime soon, possibly even until sometime next week.. That is a shambles, surely they would hire more staff! I looked up the warehouse on google maps, it looks like they have outsourced it to OIA Global Logistics, most likely using this service