Sawed off or not?

Legally purchased a Remington 870 that was previously registered and transfered into my name.
6 months later I received a notice by mail that the shotgun was being confiscated as I do not hold a prohib license and they re-classified my shotgun.
The claim was I "sawed" off the barrel.
The shotty was previously registered and transferred with no issues but some how the magical registry detected that I sawed the barrel down.
I can't prove I didn't they can't prove I did, but registry trumps.
With little help from the NFA or CSSA other than advice to buy a new barrel and get the CFO to inspect it. I did so and am now in the clear, but my old barrel that was "sawed off" was confiscated and destroyed.
Anyone with less of a fighting spirit than me would have lost the whole gun, I just lost a lot of money and time is all. Whole situation prolly took years off my life.
Magnum Peanut

Colin:
I think this might have been one of the shotguns modified illegally by the SQ and then sold off as surplus, the SQ did not have the correct authority to modify barrels.

Visit by the Keystone cops of the CFC

I have been apparently randomly selected to have the CFO visit me to 'clean up' some firearms listed as unknown, for either make or model. I was shocked at the lack of knowledge displayed by both the chief firearms officer and his sidekick. They claimed that the program used had 94,000 types and makes of firearms listed. I would be surprised if there were 940 types and models of firearms listed, as they has a great difficulty locating any of the 'unknowns' in my possession. Two examples of the lack of knowledge displayed:
1) My original Wilhelm Brenneke rifle is not a Brenneke (according to the CFO), as 'Brenneke' only refers to the cartridge. The model of the gun (ito my knowledge, Brenneke did not have any model numbers for their firearms), again according to the CFO, is Bohler Speziale. Any one that knows German firearms will recognize that as the type of steel used in manufacturing th barrel. As it stands, I have the only Brenneke Model Bohler Speziale firearm in the world!2) A semi auto Voere 22 was almost re-registered by the CFO as an air rifle, model 22lr!
The lunacy went on and on for three hours, and the above mentioned points were not the worst. They now want to return to take photos of the firearms that are not in their program, which leads me to ask a question, should I allow this? I'm thinking that it would likely be easier for them to get some decent reference books and add the pertinent information that way.
One thing that really got me going was the way they handled the firearms. They were grabbing and handling the firearms by the barrels and metal parts. I don't know about anyone else, but I have enough respect for anyone else's firearms, be they the most expensive, or the most humble of firearms, not to handle them in such a fashion.
All in all, I'm not impressed by these guys.
-- MetricMan (CGN)