Yeah, the Peanut Labs bait and switch is also similar to Opinion Miles (United Airlines).
If you look at the "Transactions" section of emiles/Peanut Labs page and click on the ones that say "Credited Survey", a popup appears with some useful info including quantity of points, date, transaction ID. I've started taking screenshots of those (using Jing from TechSmith, free software from the makers of Snagit) to be able to check whether (eventually) they all post. Each popup also provides a way of reporting problems with posting.