No I don't buy engraved tools from pawn or ads etc. While still working my way through school I had my tools stolen, thankfully mostly junk then, and forty years later it still makes me angry. I also knew some guys who sold tools off as their bad habits over took them and this just made me sad.
After my tools were stolen I got hooked up with the Police and Operation ID. I have engraved everything I have of value over an inch long with my driver's license soundex number. This includes the actual tool boxes and even personal items. This has been great when another mechanic thinks one of my Snap-On tools belongs in his box, when he states he thinks it's his and I show him the soundex number there is no further discussion. If the tool is stolen and recovered or someone tries to pawn or sell it the tool is easily traceable. The Police also informed me that they can make an immediate arrest, due to positive ID, if I report the theft and they are found anywhere. ID marks, initials etc even if reported are not enough on their own to ensure they will bother with an arrest that might not stick. I know this is a piece of personal information but one that is not much use to a lowlife.
Engraving thousands of tools was done as each was purchased. I'm getting ready to engrave a new set of ratcheting wrenches for my "B" team tools in my home garage.
I'm now the old guy and my beat up, run into by a shop owner's friend, used when I bought them, tool boxes are like a security system in itself.
Finally, the wife came without tattoos 44 years ago and the only one she has added was a humming bird.