Still didn't hear back from DMC via email.
Also got this strangely formatted email from Western Union today:
I checked, and people have 90 days to pick up the cash from Western Union. So it's not like it timed out or something. They intentionally rejected my payment.
I'm done fucking with this. If it's not a scam, it doesn't even matter because it's damn near impossible to get the goods. It's price gouging anyway... $100 for 100 grams of SALT. Yeah, maybe it's a special kind of death salt that has become difficult to find lately because reasons, but I think it's pretty shitty of people like this to prey on suicidal people just because they can.