Send two missions, one with the capture device, the other with a functioning remote-controlled robot laboratory. Leave them close to the region, set them up to explore for 50 years or so.

I know, I know, budgets. It'll 'never' happen.

But what if we just send a nano-factory with its own assembly/disassembly abilities? Feasible, 5 - 10 years on from now?

Well anyway, the point is: why bring it back, really? Just send more machines to do better jobs in space.