Wembley - Which Block

Need a little help if possible...
I bought my tickets for Wembely on-line, but forgot which block I chose. On the Account History of my account it shows that I've bought 3 tickets and the row and the seat - but not which Block I'm in...?

Is there a way of finding out..? Or do I have to wait until the tickets arrive in the post..?

What category ....£40, £72 etc

What category ....£40, £72 etc

Cat 3 - £56 bucks each

The best I can do to give you some idea (you'll have to phone/email them to find out the specific block) ....http://www.cardiffcitystadium.co.uk/wembleyMAP.jpg