I have a fortress 5 that dates back to 1994. It has a 7-piece maple/bubinga neck--I really haven't seen another neck like it on a fortress but it sounds great! The body is 3 pieces of solid flamed maple. It's an extremely un-Warwick sounding Warwick with LOADS of bottom end, sizzling highs and a typical j-style growl. I love the details: the bronze frets, the wenge fingerboard and the adjust-a-nut. All have held up very well.
That bass bass has only gotten better with age in terms of sound so I'd be all over a older Warwick with nearly 2 decades in bass form. In terms of looks, my Fortress has been gigged constantly for 15 years and it shows. Even so, it's taken the abuse. Even for an entry level Wick, the bass was very well built and it has aged like a fine wine.
I have had some warping issues with the neck but they've all been a trussrod adjustment away. Some necks can have perma-damage if they have remain warped for too long without being adjusted.
New that bass cost me 1200USD in 1996, I'd imagine a 4 string would run between 850-1000USD new. So now they want 400? Not bad. Again, consider those basses were made to sound better with age. They typically do.
I admit, I don't buy bases for show pieces or financial investments. I care much more about how something plays/sounds/functions than I do how it looks.
So, more important than dings, scratches and tape holding that plastic access panel Warwick uses (which is easily replaceable), what condition is the bass in as far as sound and playability? Is the neck warped? If it is warped, is it fubar? (a good bass tech will be able to tell you that). Are the frets warn down (almost as important as the neck condition)? Are there any dead notes on the bass? What condition are the electronics in? If all these issues are in the glass half-full and the bass feels/sounds good to you I'd go for it or try to talk the pawn shop down a bit.
Even if there are some small problems ie noisy electronics, that's typically not much to fix and a good negotiation point if you really want the bass.
My advice to you, do with it what you will, good luck.