Would you have a problem with your serial numbered gun being confiscated and then told days later that you don't have a right to them because the serial number has been defaced?
Who is going to believe you? Oh but you have pictures of them, well the authorities have the ACTUAL gun with no serial number.
I guess I haven’t worried a lot about anyone seizing my guns. I did have to keep them in the base armory once, but no one filed off the serial numbers.
But if someone seizes my gun, you had better bet they are giving me a receipt with the serial number on it, which would also make it pretty tough for them to say it was removed by me...wouldn’t it? And the serial number prevents them from giving me back some piece of junk and keeping my like new pistol.