Gee, the hivemind is apparently a really fucking lousy smuggler, we keep getting into torture chambers. Conclusion: the hivemind has a low WIS score, needs additional protection against mind-affecting spells (tinfoil hat recommended?).
Let's see:
A)…convince him that you can get him an expert from another parallel, or some information about the ruins. Get back to Ajax and explain the whole situation.
Wait, what? If we can get away from this shitty parallel, why in the world would we go back? Ok, to get our precious container and Paul - I'm sure Ajax will be just thrilled with the developments and would love nothing more than to help us recover the smuggling goods we've managed to get impounded
B)…open the container for him. They can take its contents in exchange for your and Paul’s freedom, as long as they let you have it and your devices and weapons. You will try to get in touch with one of your black market contacts afterwards to get new goods.
Yes, because after giving them the means and the power, they will consider us their best pal ever and will merrily send us away with a friendly slap on the shoulder; I mean, they seem ok, I'm sure they won't just take the goods and shoot us dead once we're of no use to them... Heracles is a salesman and could make it work, but the mark is a nutcase and something tells me he won't be a good negotiation target without further "softening".
C)…play along with Mr. Floyd, claim you are an alien. Make something up as to the purpose of the devices, convince him to let you become a mole and work for him.
And the nutcase barbarian will be really happy and totally not torture us to find the "real" conspiracy, after all he really likes and believes what we've told him so far, right?
D)…convince him to let you see some of the “alien” items. Scan them for him.
And what exactly will this achieve? Maybe we'll convince him we've been saying the truth, maybe not... And if we do, where does that lead?
E)…convince him to let you use your RGM under some pretext. Attempt to escape using it.
Could work, if he's really stupid (he is). The thing is, we would be leaving Paul behind and would have to run to Ajax for help... Again, hoping he'll be a good father figure and will clean up our mess for us.
F)…insist you know nothing more. Because that is the truth.
And this guy has devoted his life to finding the truth and will immediately recognize another truth-loving bro and let us go? Not likely.
G)…refuse to say anything at all not matter the circumstances.
i.e. Spend a long and unknown period of time being his prisoner, and hope they'll let you go / somebody will rescue you one of these years? If all goes well, Heracles might even not rot to death in a shitty prison
So, yeah, tldr,
D) and hope for the best