What’s the earliest time that you can check in at the guard shack to get unloaded

Check in whenever, but you need to have an appointment more likely than not. Check with your dispatcher to see if you have an appointment through retalix set up and if you need one.

Go walk up to the Guard office and check in when u arrive just to make sure

You can check in whenever. They have dofferent times when they will allow you into the gate though. For grocery its around 645pm-7pm. For perishable its 415am-430am they will start getting you into a door.