What happens to stuff that never get picked up or forgotten???

30-45 days to pick it up after notified and then donated.

Things that get left and forgotten after so long will be taken to Goodwill

It's donated to charity if unclaimed... "Claimed items are held for at least 14 days, though we’re happy to work with you if you need more time. Unclaimed items are eventually donated to charity (or destroyed if they contain personal information)." See: http://howweroll.trimet.org/2018/01/09/leave-something-behind-check-lost-found/

Donated.

It's given to charity.