That is a warning flag. Something ain't right.
If you buy a FZ18 from one on the internet resellers who have high customer ratings from Reseller Ratings.com, your camera will come to you in a sealed box as shipped by Panasonic along with the included accessories: a battery pack, battery charger, cable, etc.
On the other hand, if you visit a camera store, or a Costco, if you're lucky enough to have one nearby, you can inspect the camera and packaging before you buy. Personally, I would be reluctant to buy a camera from a store if the packaging had been opened, for that camera might be a "return" from another customer, or a camera used by the store as a demonstrator, and possibly damaged and/or with some of the included accessories missing.
Vann's, B&H, BuyDig.com, Adorama, and Beach Camera are highly rated resellers, among others.
Before you buy a camera (or any big ticket item) from an internet seller or a mail order house, I suggest that you check their rating on Reseller Ratings.com (
http://www.resellerratings.com/reseller_list.pl?rating_type=2&rating_history=1&category=5 )
Before I bought my FZ5 a few years ago, Butterfly Camera was underselling most of the internet resellers. I was about to buy from them. Then I read, maybe on this site, some unfavorable comments about Butterfly. When I checked their rating on Reseller Ratings.com, their ratings were not favorable. No further deliberation. I did not then need, nor do I now need unnecessary problems.
I paid about $20 more to buy my camera from a recommended internet reseller. There was a liberal return policy. For $20 the peace of mind insurance I bought was well worth it.
The FZ18 is a great camera. I am so glad I bought it. I got a good price from Vann's and never had a moment of anxiety about the sale.
Tom