Yes, you would think so. <img src="/images/graemlins/confused.gif" alt="" />
If this had happened in my jurisdiction, the firearm would be at the crime lab within an hour for ballistic tests and to "pull out" the filed off serial number. Then the investigative fun would begin.
Unfortunately, my experiences with ATF is that they are very interested in collecting taxes and fining those who do not pay those taxes. They will ADVISE on a criminal case, but have no interest in investigating a case. <img src="/images/graemlins/frown.gif" alt="" />
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"We are not allowed to stop thinking"