Returning the old product is optional. Either you can return it (and Sonos will recycle it) or you can keep it and continue to use it. The trade-up discount is the same, whichever of those you choose to do.

You may have ticked the “Send me a return label” box when doing the trade.

Shouldn’t be an issue, hopefully Support can confirm that for you.

I still don’t understand how to process to upgrade my AMP… Do I need to buy a new one?

Perhaps, then, it would be best if you were to call Sonos Support directly to discuss it.

When you speak directly to the phone folks, there are more options available for them to assist you.

As a separate note, the Amp is not eligible for an upgrade, but there are versions of the CONNECT:AMP that are. Two similar products in the way they work, but very different in age. 

Hi, i clicked upgrade a while ago on my play5 gen 2 - which works fantastically still - not knowing how it this upgrade thing works.  But now, in my sytem - its in the upgraded section -- how do i keep it my main system as i have no plans of not using it….i did just pre-order the Roam.  I have 2 one, a beam, play5 and now a Roam.  I want all of them to be kosher for a long time.  

Don’t do anything.  The upgrade status doesn’t affect the actual use of the device.