For kicks and giggles, I added up all the Model 1892 altered to Model 1896 and came up with the following. I have not been able to find anything for the fiscal year ending 6/30/1899, but I don't believe any alterations were done that year anyway.

3,508(1897) + 1,588(1900) + 6,123(1901) + 5,420(1902) = 16,639

Poyer's book shows the Model 1892 production ending in December 1895 with serial number 24,919. This may also include some Model 1896. For the sake of argument, I am using the 24,919 as the rough total of 1892's built. So the very rough total of 1892's not altered to 1896 would be:

24,919 - 16,639 = 8,280

Then consider those lost, destroyed, somewhere in another country, sporterized, etc.  Can't be too many left in original configuration. Of course, we already knew that.

Also in Poyer's book he mentions that the 1892 altered stocks with the rounded cleaning rod channel filler (as mine is) was done to "new, unissued rifles" (pg. 39) in 1897. I'm not sure where he found this information. For now, I am going with that. Still there is some conflicting information to sort out. If anybody has some better info I'd like to hear from them.