I have two rifles with R&R entries, one or both involving barrel (and chambering) changes but with no details other than a work order number. I agree the amount of detail is unusual based on the very few I’ve seen. I’m also a bit puzzled about the 1895 build date in the ad copy, letter doesn’t support that date.
The 1895 date in the ad copy is incorrect. I believe they are using the inaccuate George Madis date of 1895 rather than the accurate polishing room record date of 1898.
Good to know, I devalued a very interesting rifle in my collection when I learned it originally left the factory as a 38-55. Like the OP rifle it now has a 30 WCF barrel. No details in the R&R entry but it appears to be a factory swap.
I experienced the same “surprise” when I received a Cody letter for one of my real nice 1894 semi-deluxe takedowns. It was originally 25-35 and is now 30 WCF and has two R&R entries ( one in 1898 and another in 1899) with no details except for a work order number. I’m certain that the caliber swap occurred on one of these since all barrel markings are correct, no proof marks on barrel or receiver, and clearly looks like factory work. I even removed the forearm to see if there was a “J.P.P.” stamp, but no such luck.