I was digging through my desk yesterday and found an unused points card from like 2015 for 1600 points... I don’t have my Xbox 360 anymore... can I do anything with this card?

Do you have an Xbox one? Try putting the code in and see what happens.

No xbone
360 been in closet 5 years

https://account.microsoft.com/rewards/redeem/

try this link, on bottom left is a "redeem a code" button, enter it there. Hope this helps.

I believe the only way is to use a 360 to redeem them, from what I've read. The website will likely give you an error, and they can't be redeemed on an xbox one.

I'd gladly take them off your hands if you can't redeem them, still got a few 360 consoles kicking around.