From what he's seen, Adderall seems way overpriced on the darknet. If people are paying these prices for it then he wants to see if he can get a piece of the action with (slightly) more reasonable prices.
His issue is this: he only has access to 60 20mg IR pills a month. He just wants to unload that in bulk rather than deal with packaging and sending multiple orders every month. But with so few transactions it would be difficult for him to ever establish a name as a reputable vendor.
He wouldn't send his bitcoin to a vendor without name recognition or a number of people who have vouched for him, but he would be banking on the fact that there are other people would. Would you buy from a vendor like this or is he going to have to start by giving out free samples?
If they're priced reasonably enough you could probably sell them without a rep. The demand for the little shits is ridiculous. Put the whole bottle up for a price just a little bit cheaper than what everybody else is selling them for, like $4-500 or so, saying everything you posted here in your vendor profile. Somebody will take a chance on an escrow order for a vendor without feedback if you explain your just unloading a monthly script and the price is right. However, to get it listed you'll have to pay the vendor bond, which is 0.6 btc on Agora. After you sell a few scripts should be smooth sailing. You could charge more after a few successful orders