... or at least a seller who has a very close working relationship with one.
I've been thinking about the issue a couple of our members are having with Jason. I'm willing to bet Jason is just a middle man, who goes around and buys guitars from various factories when he gets orders.
In the cases where the guitar arrives damaged, Jason himself is likely going to have to eat the cost. If he goes to the factory, they will tell him that the guitar was fine when he bought it from them, and they aren't responsible for what happens to it after it leaves their warehouse.
If you were dealing with a factory, you might have a much better chance of getting them to accept the return, as they would feel directly responsible for it.
The difficulty is knowing who has an actual factory, and who is just a reseller.
I know for sure that Rare Electric Guitar is a factory, mainly because they build guitars nobody else has and don't offer them for sale on AliExpress - only selling direct. Of course, you pay a premium for their guitars (often $200 more than other sellers.) But they do, in theory, have a bit better quality.
My guess is that the best sellers to buy from are those who can get custom work out the door quickly, and who can easily supply photos of the build in progress. But even then, there is no guarantee that they are factory direct.
The two most important things to remember in life: "The only time it's acceptable to work with amateurs is if you are making porn." "If you want to work with clowns, join a circus."