I now have 2 surplus cable modems - keep or dispose?

I recently returned to Xfinity thanks to the 5 year fixed price no data cap offer. I left a few months ago when Xfinity refused to negotiate a better contract price.  I had been with them for over 10 years and was a happy customer until that point. Fiber locally was a much better deal. But $50 for 1Gb locked in for 5 years could not be ignored.

For the first time, I am using a Comcast Modem / Router. It is set to bridge mode because my home network is too complex for a Comcast router to handle. I'm happy. Bridge mode is completely transparent. 

But I now have 2 Motorola cable modems in storage. One has a 2.5Gb port, the other is 24x.

What should I do with them? Do they still have value to anyone? Or are they now expensive garbage?