One would think that the 10 domes MA had listed in the auction for the station would include 10 "land deeds" but from looking in the control room I count 4 land deeds for 20 domes that could be sold. Is my thinking off? Will Neverdie see 6 more as yet unknown land deeds?

Each fertilizer station contains 5 domes, making 20 domes in total.

No idea how many actual Land Deeds it involves, and tbh it souldn't matter unless ND ever decides to sell one of them (why would he do that !?!).

Yes thats correct 4 X 5 = 20 He has the deeds as each station was not owned by him till he came over to claim them.

And he probably has deeds for the market stalls and maybe even the arena??

I think that are deeds of market stall
or MA is planning to expand the mining/hunting area with other 10 dome

The Only deeds he has are for some apts and for the 4 domes. He has not got any of the stall deeds as MA has not coded them all the way yet.