I mark all of my expensive equipment internally with my name so that it can be legally identified if found. Examples: marking my name with a fine permanent ink pen inside the bass control cavity, inside the back cover of amp, inside any screw on housing, etc. I also maintain an updated list of everything I own including serial numbers and digital pictures of all of my gear (digital pictures are bassically free and only require a moment to take. Always assume that there are thieves around waiting to steal your stuff at any time, because if you do any gigging or if your gear is where it can be publicly seen, then there WILL be thieves drooling over it at some point and they are only waiting for an opportunity to steal it. Don't give anyone that opportunity. If I ever have anything stolen I would scour the local shops and also craigslist and ebay posing as an interested shopper. Then, if I DO spot it, I DON'T tip them off that I'm anything other than an interested buyer, but I get the police and explain to them that I have proof that my stuff is in the posession of thieves (this is where taking pictures and making lists and marking and identifying your gear works) and demand that they recover it for me NOW while I go along with them to positively identify it and press charges. And if I had good reason to think that the police would not be able to help in that particular instance, I would only then consider acting on my own and possibly using force to get my stuff back. And remember the rule about violence: Use force only as a last resort, but when it becomes necessary, use it in amounts sufficent to win.