I'm thinking we gave A LOT more than that...
First of all, apparently we had no one with actual knowledge on what these guns are worth, at least no one spoke when Silk asked.
Second, if we do know the value, make sure to adjust its value. Fenced gear starts at 30% value. Adjust that for being used, stolen and used in a crime that's being investigated... the modifier in the book for that is -50% (and that's using a very generous -10% considering the severity of the crime: a veritable bloodbath in a popular nightclub during opening hours).
Third, we were in a very poor bargaining position, not knowing what we need, how much of it we'll be needing or when we'll need it. Their flexibility is worth quite a bit too.
And there is of course the fact that they're a gang of criminals who we want to be on our good side, so being a bit more generous than 'by the book' prices makes sense.
On top of that, on a personal matter, Silk would've never taken those guns from a crime scene this hot in the first place. They're the only things tying her (if memory serves me right) to the murder of over a dozen of civilians, an entire squad of mercenaries (also over a dozen people) and the attempted assassination of a politician who's also high-level humanis leader. Ever since she found out Andromeda and LJ had conspired to take those guns, she's been looking for a way to get rid of the damned things as quick and clean as possible. This looked like a golden opportunity.
All in all, getting anything positive out of these weapons is already a positive surprise if you ask me -or Silk, for that matter-.
So she gave 'em all of the Uzi's except maybe the one or two someone (sorry, forgot who) was borrowing while looking for a better gun.
(Also, pure metagame, the guns were LJ's/Andromeda's... Since both players are now gone from the game, I already feel slightly dirty still using them. But since this was set in motion before Kouryuu went up in smoke...)
If any of you have a problem with that, that's perfectly okay. Most of you(r characters) don't know the story behind these guns.
But then again most of you(r characters) also weren't present at the negotiations either...
Feel free to comment to Silk on IC if you don't like the results she got. She's a nice girl, I swear she will take the criticism with a smile and an apology.
Or, you know, poke holes in my reasoning here on OOC.