That's a terrible tale! Sorry to hear of it! But their may be some truth to what the woman said...some tinkerers do break stuff, and they lie to the dealer about it! Then someone at the mail-order house is told to "rob" a part to make someone else happy, and the never-ending tale takes shape, especially at this time of the year. I'm not saying that she was polite, or that you were handled correctly by her, but she was probably truthful. And exasperated from all of the years' worth of horse-trading and parts "missing" that comes to a head this time of year when lots of product left on the shelves with forgotten "missing" parts comes to light. That's part of the reason that the DEALER wanted to deal with the distributor (Lyman).
What you should have done was just have the dealer make good on it as he tried to, or ask the dealer for a new one altogether. The DEALER sold you an incomplete bag of goods (probably mail-order). Lyman dealers (especially those with walk-in brick & mortar operations with finished guns on the shelf) stand behind their stuff. And the folks that pay a few bucks more for the pleasure of fondling the gun and inspecting it prior to the sale get EVERYTHING that comes in the box.
Mail-order just works that way...not just at Lyman and especially not just for firearms! Sometimes the best price isn't the best deal.
Hope that you like your new rifle and enjoy shooting it in good health for the New Year!
Dave