Good question. Beyond what you already mentioned, there are a few other bits of archaeological evidence from Balochistan and nearby regions that sometimes get overlooked.
At Mehrgarh (Neolithic period), there are plant fiber impressions in pottery and traces of bitumen that could point to hemp use. It’s not 100% proven, but hemp is often suggested because it fits the tech and materials they were using at the time.
In the wider Indus cultural sphere, there’s decent evidence for strong bast fibers being used for ropes, nets, and textiles. We rarely get perfect plant IDs that far back, but hemp is a very plausible candidate given how well it grows in the region and how useful it is.
There are also seed finds from various sites in and around Balochistan that match cannabis pretty closely. Whether that was wild or cultivated is hard to say archaeologically, but it does show the plant was present.
For psychoactive use, the evidence is more indirect. Later sites in Iran and Central Asia have ritual fire altars and burning residues linked to intoxicating plants, and Balochistan sits right in the middle of those cultural exchange routes. So while there’s no clear “proof,” it fits the broader regional pattern.
Bottom line: no single smoking gun, but a lot of small clues that suggest cannabis/hemp was known very early in that area—at least as a fiber plant, and possibly more.