You might be very surprised at how good it looks after being shipped!
ITA with the others, that laying it out and giving it some time, will help ease out any that might be there.
Another option would be to toss it into the dryer with a couple of damp towels (not fresh out of the washer, just dampened, or partly dried after washing). Tumbling in the dryer with the damp towels will give some steam which can help loosen the wrinkles!