Buying a Juniper switch from a non-approved vendor?

I'm looking to buy a new factory sealed Juniper switch, however, the switch is not from an approved Juniper vendor. I have a few questions below in regards to this.

- Is that ok? Will the switch still work properly?

- What are the downsides of buying a factory sealed switch from a non approved vendor?

- When you buy a new switch from Juniper, and you unbox it, what are the steps needed to do to make the switch work? Does the switch need registered with Juniper after powering on the first time? Does a license need to be entered entered on the switch before it works?

- Will I be able to get future firmware updates for the switch?

Any help is greatly appreciated.