Postals are very much active. If you have some old carves you want to send out, just list the tracker and watch it fill up fast - some are completely signed up within hours! There are a lot of newer people who would love to see your carves.

Some things have changed with the last two(?) years. Now that the USPS doen't charge extra for tracking a first class package, the majority of postal participants have gotten away from using postage stamps when mailing, and go to the post office to get their postage sticker and tracking number. The tracking gives peace of mind, knowing that the postal has reached its destination. So, expect envelopes with a lot more stickers to remove and looking for the tabs of the clear tape :)