Comment wasn't made to make anyone bristle. I've been following vintage guitars since they were "used"... and affordable. A lot of the cheap ones I picked had no case or the wrong case, most of the better ones always had a case, and preferable "the" original case. I can't imagine someone buying a Les Paul or a D28 and opting out of the case. The first Tele cases cost $40 when the guitar was $150, cases have always been expensive investments to keep your baby safe.
In this day and age, it is actually rare when a guitar still has it's original case, because of wear.
I've often bought a vintage guitar in the wrong case, which may actually be better for shipping anyway, and then find the right case on eBay later.
I have bought near mint vintage guitars that had no case before, not even sure how this works. Guitars are magnets for bumps and bruises, navigating point A to point B without hitting something is usually an exercise in hyper vigilance...
The local chain of pawnshops here separated the guitars from the cases for years, to "use the case to sweeten the deal" at the time of a would be sale, except with turnover, no one knew this and they'd routinely sell the guitars without their cases, sometimes ending up with a whole backroom full of cases for guitars that are sold.
I found this out years ago when I bought a Strat, the sales clerk couldn't find the case, so he let me go through a room full of cases until I found it, and in the meantime unearthed all of these rare cases that went fo Flying V's and other weird guitars where only that case fits. By the time I found the Strat case, there was a giant pile of cases that didn't go to anything and he sold me the whole lot for a song. I had an old SAAB 900 3dr (about as much room as a 1/2 ton truck inside) and I filled it to the gills with cases, $50 I think it was. Took me about three years to sell them all, and each time, I reunited a rare guitar with the correct case.
Some people, like me, get just as obsessed about finding the right case as any other part of GASsing. The most expensive cases, for the most expensive guitars, like a Sunburst Flametop, can hit upwards of $3000 for a mint 5 latch "Cali girl" case.
The guitar and case are a pair, a package. And then there's the case candy. I sold the correct strap for a '59 burst for $500. I got it for free in the case of a Lyle that was worth about $75.
Some guys sell the original case to buy a new clean smelling SKB case.
Some guys sell the SKB and find the original case.
I'm that guy.