You may need to move some mulch around....on villas the cleanout is usually in the front, but on the larger homes it could be on either side. As jimbo said, look for a 4" white thread female adapter with a 4" threaded cap on it with a square "nut" on it. It is usually at or just above ground level.
There have been instances where construction debris or concrete has gotten into the lines.......just a quick cleaning out of the toilet trap is not enough. You may need the complete sewer line system for the home looked at with a "see snake" camera to make sure there are no obstructions.
Since you said it was a pre-owned it could also be tree roots, a collapsed line or a joint that was never properly glued, etc.....only a see snake will tell you for sure and give you peace of mind.
I have in rare cases found where the lead flashing on the roof vents were not folded over properly thus not allowing intake air to the system and hurting the flow. I have also seen plumbers snake a sewer line from a vent, but it is preferable to do it through the two way main cleanout.
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Florida licensed Home Inspector #HI688. (352) 250-7818
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