Well a quick look on UK ebay show several play 5s for sale some of which have bids against them. So I would say better to find a home for it rather than throw it away

If you bought it before 2015 it will be Gen1

Here is a photo of the Five, Play:5 (Gen 2), and Play:5 (Gen 1):

If you are interested in getting a new Sonos speaker, you could see if the Play:5 is eligible for the Sonos Upgrade Program. If it is, you can get 30% off (if it’s a Gen 1) or 15% off (if it’s a Gen 2) the purchase of a new Sonos speaker. And you can still keep or sell the old Play:5.

Read more here:

https://www.sonos.com/en-us/upgrade