Ok so not really, but I think that a medieval/fantasy styled gun or two would not be too bad. They are rare in occurance, but we are seeing more of them with Monte Cook's Ptolus (a great game by the way that I love playing in) and World of Warcraft RPG. A pistol and blunderbust would cover most of the firearms used in fantasy societies with some tech in it. Just a thought.
Also if you want to add some suspense to your game AND have your game be a little bit more organized I have a suggestion. Select what item cards you will be in various chests ahead of time. Go ahead and put them, along with a slip of paper mentioning any gold/silver/copper/whatever into the envelope. When they see the chest give them the envelope to open. If the chest is trapped, I like to write it on the inside of the envelope. When they open the chest/evelope they get a message like "TRAP! Roll a fort save." My players seem to get a big kick out of it. Also it makes them more mindful to be careful.
Also while I am here, just wanted to say that I really like the item packs and finally got my local gamestore to start carrying them. I know of two other games that now use them as well in our small college town.