I was on the left (passenger) side, only noticed it because there was some reusable bags that looked damp when I moved them.

So I checked behind the lining on that side, all dry.

So took out the spare wheel...


It was all damp under the wheel.

This is some extra lining I had put in, made of the same stuff as the new boot floor carpet from Bunnings.

But its like a big sponge... this was several minutes after I took it out and put it in the full sun, lifted it up only for water to run out like this.

Here is the under side of the spare.

Now in full disclosure I had got some turf just before but it was not wet, plus I'd lined the boot with a tarp before had and was in the process of vacuuming the boot carpet when I saw the damp bit.

So the question is how long has it been like this and how did water get in? I has been wet around here lately but I hardly open my boot when its raining and I'm not under cover.
And unfortunately I don't remember the last time I took the spare out, maybe over a year or 18 months since the trip to Adelaide.
Is there any history of leaky boots in the CJ sedan?