Oh lordy, I just love your mother
And I am cracking up at Kindeyes because a toilet is such a common "stash" hiding place.
To avoid scaring off potential buyers with his weirdness, perhaps take the toilet out now and replace it with a new one. If I looked at a house and the agent said "the appliances and drapes stay but they are keeping the toilet" I'd run out the door faster than you could say "flush".
Thank you for the great laugh here.
Hugs