Not worth all that trouble and haggling at this point;
Quit messing around with him.
Just tell him to return it (at HIS expense!) and then once you have it, include it again with the sale of your Caprice wagon,and refund him his money.
I haven't a lot of patience with budget-breath cheapskates like that; one of these days he will get caught putting xerox dollar bills in the coin changer of the local laundromat.
And in the meantime don't be surprised, if he asks you, in addition to everything else, for a apology ----- and a ride in the Mayor's limousine.
Miserable slimebag, DB, loser.
__________________

1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...
1995 E 420, 170k "The Red Plum" (sold)
2015 BMW 535i xdrive awd
Stage 1 DINAN, 6k, <----364 hp
1967 Mercury Cougar, 49k
2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive

(sold)