Hi, I also am having a problem with receiving the coins from a cash transaction through moneygram.
I went back in my browser history to the quote page, and if that worked correctly this is the information:
Quote ID is: b8c74966-1815-4fdb-acd0-235b21c8e0dc
Event ID is: 8f44a25b-d328-4fcd-975f-502e98b9da1e
I don't know if it's safe to post the moneygram reference #, so i won't unless you ask.
I've done several seamless transactions in this exact same way to this exact same address, and it's usually been pretty quick. so far it's been 9 hours and i haven't received either bitcoins or any emails from BitInstant.