I just got an email from an agent who was shopping for the Infrared Keyboard I use and cover in my classes. She went into a Best Buy to pick one up and was told they do not have a IR keyboard that works with her Treo 755p. It so happens I have Treo 755p here in my pile and the Palm model number 3196ww IR keyboard. After loading the software into the 755 all the functions work correctly.
In my opinon, I think somebody is attempting to market their new $99 Bluetooth keyboard to make current owners of the 3196ww upgrade. Also new buyers spend $30 more to get the Bluetooth when the IR not only is cheaper but I need to check on one fact. The phone manufactors state the phone will only work with one Bluetooth device at a time. So if you are entering information with your keyboard and on the phone using Bluetooth one of them isn't going to work, (I think).
I plan on testing the Centro soon, the one from my pile is missing as we loaned it to a family friend.
Here's what you need to look for;

Dick Betts
National Speaker Real Estate
National Real Estate Speaker
Mobile Technology Trainer
www.DickBetts.com
My guess is that the BB person simply looked at the package, didn't see the 755p listed (it is a newer unit...) and said it didn't work. If it is using an IR signal it shouldn't make too much difference what unit it is.