A small child's knit glove didn't do this to a toilet, did it?

Three toilets in the house, two upstairs, one downstairs not hooked to water supply and always bone dry. Two weeks ago, a child's knit glove fell into the farthest upstairs toilet. Two weeks later, the never-used downstairs toilet overflowed with water and toilet paper, no solids, no smells, no moisture on the ground, no visible signs of anything else wrong. This downstairs toilet is about 12ft. in from the access cap sticking up in the yard. I removed this downstairs toilet, and all upstairs flushing rushes through smoothly, no back-ups. Why was water and toilet paper backing up into this never-used toilet? With flushing, the water level in the sewer access pipe rises slightly then slowly returns to about 4 inches down? Is there a problem in this area? I am leaving it removed for now and blocking the hole with a Gripper Mechanical Plug. Would it be advisable to run a snake from this removed toilet out to the access pipe? Thanks again for answers. Brief added question: How come there was no evidence of solids or smells when the water backed up, only toilet paper?
Answers

Anonymous

If a pipe clogs and backs up it will fill any available inspection chamber and pipework, and then start backing up the pipes/stack to emerge at the first available point which would probably be your ground floor wc. What is a mystery is how your downstairs wc is open to the sewer with no water to replenish a trap.

Dan B

That toilet was closest to the blockage and the first point where water from the blockage can escape. That glove could have caused the problem.

elhigh

You asked this question already, and what you really need to do is to stop fixating on the glove and get the pipes cleared out properly.

Spock (rhp)

sewer downstream of the access needs to be snaked out. this is a job for a power snake -- call a plumber.