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haven't got a spanner that'll grab it inside the freehub body
Once you have the driveside lock nut off, the one should only be finger tight. If you can't get a wrenching there, pliers should provide enough grip on the cone flats to allow you to spin the axle out.
I think there should be wrench flats on the NDS cone, it's possible that the dust shield has become dislodged and is obscuring them.
I took the rubber seal off. No parts missing. When I tried to loosen it, the drive side just came off fine. I tried using the cone nut on the drive side to get some purchase but haven't got a spanner that'll grab it inside the freehub body. Could i remove the freehub body to get to it?