Switch – Light with 2 4-way switches and 1 3-way switch

multiway-switch

I'm a home DIYer and have some familiarity with electrical work. I recently bought a home and am replacing the switches. In the upstairs hallway, there are 3 switches that control one light. After researching online, I learned that this should be handled with two 3-way switches and one 4-way switch. However, it looks like my setup has one 3-way switch and two 4-way switches (see pictures). The house was built in 1985 and am fairly confident there is not a fourth switch. Can anyone explain why this was setup this way or what I have wrong?

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Best Answer

In the comments, I suggested that there may have previously been a 4th switch and to look for a blank switch plate somewhere.

The answer was that there was actually a 4th switch (2nd 3-way) elsewhere in the house.

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