Best case: Wipe all codes. Announce it ahead of time then do it. Then make them random. Make the guns random. They appear ONCE per week/month. Prehaps make the wreck location random too.
Other option: spam them. Make them sold all over AND factionalized. Each faction has a few codenames that belong to them. Cerebus and Jade belong to Rhinland (found on old rhinland wrecks) etc etc. Just make them expenseve.
Also the occasional codename for caps would be nice too. Prehaps an anti fighter gun that actualy works ?