At first I also had difficulty understanding the word, but then …
https://en.wiktionary.org/wiki/swag (not a slang dictionary, but yes, coming from thieves’ slang )
#2, stolen goods, booty, (or “loot”, “plunder”)
Like people also say “it was a steal!” even if they didn’t really steal something, just meaning they got good stuff for cheap.
When I get discounted products at the local supermarket because they had reached shelf life I also say “I made booty”
I guess “swag” would be a lot better, of course, than just some dairy products, rather like gold and silver and gemstones.
Or … OGS-branded mugs and T-shirts, OGS lanyards, coasters, caps (like, “MAKE GO GREAT AGAIN” ), any branded paraphernalia, all kinds of things which, to OGS lovers, would be just as valuable as gold, silver, and gemstones
I think I can imagine wearing a beanie with the OGS logo and “MOGO”