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Hi, I'm Mike G and I'll be assisting you. My best suggestion is to install 2 motion detectors and make a modification to the wire connection allow that.
The modification to the connections depends on how they are currently wired. There are several ways. You need to tell me the colors of the wires on each switch, the color of the wire on the black screw of each switch and the make up number and colors of the wires at the light. With that info I can direct you.
You have another option. Instead of an infrared detector use an ultrasonic detector. It doesn't depend on motion only. It senses movement by waving in the air. It will work around corners and even if behind a shower curtain. It would be installed in one box and the other switch wouldn't be necessary. I would still need to know the colors on the switches.
Not having a white wire on the switches indicates the feed is at the switches which means no modifications are required at the light. The wire on the black screw is the feed. In the box there has to be a white wire connected to a white wire or several white wires. Those are the 2 connections to a detector. Now either one of the other wires connected to the switch can be connected to the red wire from the detector. At the other switch, remove it and connect the wire used on the red to the wire connected to the black screw.
Having one switch with a white wire doesn't confirm unless you have a white wire connected to a black wire in the first box. As I said there are several ways, all acceptable, to wire 3 way switches. Give me the count and color of the wires in the first box. Let me know which one you intend to install the motion detector.
Just remembered that there is a 2 wire motion switch not requiring a neutral and can be installed in both switch boxes. Lutron MOPS2. Still need to know the count and color of all wires in box #1.
No problem. Come back when ever you're ready to continue.