Dosing, I definitely agree with what you're saying. Especially if you're only buying "one" at a time.
Right about the time that catalogue came out, I was purchasing sealed crates of all matching K98s, fresh out of East German warehouses, via International Firearms, or Century International as we know them now.
They were delivered with all accessories, including slings, ammo pouches, non matching bayonets and cleaning kits. All came fitted with muzzle guards, and all had lovely perfect laminated stocks. Of course, these were FTRed rifles and the serial numbers in the crates were non sequential.
K98s in factory crates, with sequential numbers were obtainable, but at five times the price. I can't even imagine what a crate of sequential numbered, NIW Kar 98K rifles would fetch at auction today.
I will admit, I bubbaed several crates of those beautiful East German K98s. They were cheap in comparison to a commercial sporting rifle and the cartridge they were chambered for was carried in every small business that carried ammunition. I would take off the upper hand guard, remove all the bands and cut the stock, just behind the band and round off the end, then sell the rifle for twice what I paid for it and if the person buying it wanted a good knife, he could buy a bayonet for $5 to grind into a "good hunting knife"
I usually threw in the slings, cleaning kits and ammo pouches. I would have needed a small warehouse to keep all of that stuff, which was available at "Surplus" stores, like Crown, Three Vets and dozens of others for pennies.
I found a half dozen very strange holsters at the Three Vets Surplus store in Vancouver. They were all US marked on the flaps and dark brown. Turns out they were made up especially for the "LUGER TRIALS GUNS" and were sold off after. Allan Lever, took those off my hands, I can only imagine what he did with them. Knowing Allan, he likely "gave" them to people who were interested in collecting P08 variants back then.
Canadian First Nations folks were given thousands of K98s and Lee Enfields for sustenance hunting. I don't know what ammunition they were given but I did purchase several of those rifles from them, usually carried hard but taken care of where it was important.
I didn't see any ammunition with government of Canada logos, but I remember seeing lots of Dominion brand and Winchester Western brand.
I really miss the old Dominion, CIL brands. They manufactured all sorts of ammo that quickly became unobtainable in Canada after they sold out to Valcartier Industries, or IVI as we call them now.
They produced, 6.5x55, 8x57, 7x57, 303 Brit, 43 Mauser, 7.65 Argentine (7.65x53), 6.5x53, 6.5 Carcano, 455 Webly, and a myriad list of others. Not only that, most towns had at least one business which carried everything they made, because they didn't have to pay for it until they sold it.
They even sold components for all of these cartridges, which were only available by mail order, unless you were lucky enough to have a store owner in town who didn't believe hand loading was alchemy or questionable magic.
Hudsons Bay, Simpson Sears, Marshal Wells and just about any chain store offered mail order, just like Amazon, except that's how 50% of Canadians shopped back then, for everything which wasn't perishable.