Doesn't sound like it had a pleasant journey getting to you
i wouldn't heat it with a hairdryer while still sealed, the moisture stays inside an condenses elsewhere
moisture needs to be able to escape
normally I would spay 100% isopropyl which the moisture mixes with and evaporates off.
however just leaving it open in a warm dry place will work just takes longer. Old fashioned airing cupboards were great for this.
Be careful with a hairdryer. There hot enough to damage plastics. Use a warm setting and keep it moving