Don't know if SA Inc had a "loaded" model back then, but the ones now don't have hooded rear sights.
As for the bolt roller, I am unsure what you are referring to, as mine is bright and shiny unfinished metal. Perhaps its dried out plastilube that's flaking off. Not sure what would happen to plastilube after ten years or so out in the open air, but plastilube is a kinda golden brown. Regardless, if its been sitting in storage for a long time, I'd strip the whole thing down for a thorough cleaning and lube all parts where appropriate.
Replacement bolts are not a drop in item. They need to be properly headspaced by carefully lapping the lugs, or by trying to find one that headspaces properly from a large supply, which most of us don't have.
As for the "panic," not being the old guys shrink, I don't know what sort of anxiety disorders of paranoid dillusions he may suffer from.
He may have been referring to the anxiety felt by some prior to the enactment of the 1994 AWB.
Congratulations on your new rifle. One last bit of advice, buy plenty of ammo (I mean lots and lots) and go out shooting as often as you can, even if you have to call in to work sick occasionally.