Based on
Chako's Gerber information I'd say this unit was initially made in 1999. If this reads Gerber USA, this is definitely from that time period or early 2000's. This has been discontinued for more than decade and factory sealed makes this unit more valuable to collectors.
Without any images of a new old stock in factory packaging, providing a price is challenging. I'd say upwards of $100.000 United States dollars. If images can be provided, this would definitely help those that may have more evidence to bolster any claims.
In my personal opinion, I wouldn't open this, rather sell this unit as this is worth far more in a box than outside of the box.