It takes a good 2 months to start realizing any significant savings from refunding. Most offers take 6-8 weeks to receive . Trades should be mailed the same day or next day unless agreed upon otherwise. If you haven't received a trade within 7 days you should email the other person. We all make mistakes and most times a simple email will clear up any problems If you have a problem with a trade, please don't post it publicly.
Nobody likes to receive postage due mail.
You should only be sending current identified proofs of purchase in your trades. Extra goodies in a trade envelope are always appreciated, although not required. Don't leave people hanging. If you've already traded an item, please let people know. You can also post a follow-up message on the board stating the item was traded in the title.