I wouldn't say it's uncommon now.just got another msi package. a motherboard and it was also not sealed. maybe they dont seal it? or im just unlucky and got a used mobo and used gpu? its also from 2 completely different vendors. i dont know anymore.
Couldn't say for certain, usually the original manufacturer will during packaging stage.msi puts the seal on it or the reselller?
I wouldn't immediately, personally I would contact MSI directly. Then await their response.ok, thanks. i will send it back then.