Be prepare for the worst. If they don't pay you, open threads against each one of them with their name in the subject here: https://bitcointalk.org/index.php?board=83.0 Post your transaction id with a link to blockchain.info or http://www.cryptocoinexplorer.com/ and a scan of a PM where each one indicates you his address to where you sent the money.
Well, it turns out that indeed both are the worst cases. The two showed up in the forum, but still I haven't got anything payed, and got no pm from any of them. What a lesson !