OK, I take the point that having realistic copies on the market increases the chances of fakery and passing off by the unscrupulous, but on balance I think it's better to have good facsimiles out there than not. Many a Webley pistol has been enhanced by the 'new' old boxes and it can only help improve pride of ownership to be able to buy one. It doesn't make the genuine article any the less desirable, surely?
Of course, all honourable reproducers of airgun memorabilia should add a sign to alert collectors they are dealing with a copy, or even incorporate the word 'facsimile' unobtrusively into the design - maybe inside a pellet box? But the world being what it is, there will always be fakers looking to deceive and collectors of the genuine should be cautious with their money, as always.
I'm thinking of the little Frank Morton Webley Service booklets, which were realistically reproduced some years ago. It's long enough ago that some of these have aged and are dog-eared, making them look like originals. But real collectors would know. I have one and it's probably the closest I'll ever get to an original.
Protek also reproduced one of the BSA manuals IIRC.
In the rare books market print 'on demand' has given cheap access to knowledge previously only possible by visiting a library in person. I think technology is generally a good thing, despite its having a 'dark side'.
Here is a pic of some good repro pllet boxes made by a fellow collector.