All of the letters I've received have a basic history of the model in then first paragraph which as you say can be commonly obtained.
Personally I only letter older guns and like most here I'm looking for the info in the last paragraph. That info is where you pay your money and roll the dice. We all hope it was shipped to some famous person or organization, but most times it's just some mom and pop hardware store. Even if the gun doesn't have some exciting shipped to info I enjoy investigating the history of where it went even if it's some hardware that has long since went out of business. For me the letters have value even if they don't add value to the gun.

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SWHF #595